Amazfit T-Rex 3 User Manual - Global Version

Connection and Pairing

To connect and pair your Amazfit T-Rex 3 smartwatch, scan the provided QR code to download and install the Zepp app. For optimal user experience, ensure the app is updated to its latest version.

Note: Your mobile phone must run Android 7.0 or iOS 12.0 or later.

Initial Pairing:

When the watch is first started, a QR code will display on the screen for pairing. Open the Zepp app on your phone, log in, and scan the QR code on the watch to complete the pairing process.

Pairing with a New Phone:

1. Open the Zepp app on your old phone and synchronize data with the watch.
2. On your old phone, navigate to the watch's information page, tap "Unpair" at the bottom, and unpair the old phone from the watch. If using an iPhone, you also need to unpair the Bluetooth connection by finding the watch's Bluetooth name in Settings > Bluetooth, tapping the information icon (i) on the far right, and selecting "Forget This Device."
3. Restore the watch to factory settings, then pair it with your new phone following the initial pairing procedure.

Updating the System of Your Watch

Keep the watch connected to your phone. Open the Zepp App, go to Profile > Amazfit T-Rex 3, and tap "System Update" to check for and apply updates.

It is recommended to tap "Update Immediately" when a system update message is received.

Wearing the Watch

1. The watch strap should be worn comfortably, neither too tight nor too loose, allowing skin to breathe. This ensures sensors function correctly while maintaining comfort.
2. For accurate blood oxygen saturation measurements, wear the watch correctly, avoiding wrist joints. Keep your arm flat, ensure the watch fits snugly on the skin (tighten the strap properly), and keep your arm still. External factors like sagging arms, shaking, hairy arms, or tattoos can affect measurement accuracy.
3. Tighten the watch strap during exercise and loosen it afterward for comfort.

Basic Operations

Gestures and Buttons on Watch Face Page

Commonly Used Gestures and Buttons

Control Center

Swipe down on the watch face page or press the UP button to enter the Control Center, where you can access system features.

Supported Features:

1. Default display: Flashlight, DND (Do Not Disturb), Sleep mode, Theater mode, Always-on mode, Calendar, Buzzer Intensity, Battery, Brightness, Find Phone, Alarm, Lock Screen, Settings, Bluetooth and Wi-Fi, Headphone, Night Display.
2. Can be added: Volume, Barometer, Compass, Timer, Stopwatch.

To customize the Control Center, long press any icon to enter edit mode.

Find the Phone

1. Keep the watch connected to your phone.
2. On the watch face page, swipe down to the Control Center, find and tap the Find Phone button (bell icon). Your phone will vibrate and ring.
3. Alternatively, go to the App List, tap "More," and then tap "Find My Phone."

Find the Watch

Keep the watch connected to your phone. Open the Zepp app, go to Profile > Amazfit T-Rex 3, and tap "Find Device." Your watch will vibrate and buzz if "Vibrate For Alert" and "Buzzer" scenes are toggled on in the watch Settings. (Default is vibration only; buzzer needs manual setting: Settings > Sound and vibration > Buzzer > Scene > Other, then turn the switch on).

Watch Faces

Change Watch Faces

1. Wake up the watch face, then press and hold it to go to the watch face selection page.
2. Swipe left or right to preview available watch faces, including built-in and synchronized online watch faces.
3. Tap the desired watch face to set it as current.

Watch Face Compilations

Some watch faces support compilations, allowing you to view and edit information such as steps, calories, and weather.

Edit Watch Face Compilations:

1. After waking up the watch, press and hold the watch face to enter the watch face selection page, where you can choose or edit watch faces.
2. Swipe left or right to preview available watch faces. The Edit button (pencil icon) appears at the bottom of watch faces that support compilations. Tap this button to edit the compilations.
3. Select the compilation to edit. Tap a compilation, or swipe up/down to switch between compilations.
4. After editing, press the upper right button to finish and enable the watch face.

Always On Display

If enabled, the screen displays time and some information in standby mode. This feature significantly reduces battery life.

Set Always On Display:

1. After waking up your watch, swipe left on the watch face or press the BACK button to open the App List, then go to Settings > Display > Always On Display.
2. Select the watch face style and enable Always On Display.

Add Watch Faces

The watch includes default watch faces. You can also synchronize online watch faces from the Zepp app Store or set a phone picture as a watch face background.

Add Online Watch Faces:

1. Keep the watch connected to your phone, open the Zepp app, and go to Profile > Amazfit T-Rex 3 > Watch Faces.
2. Select one or more watch faces and synchronize them to the watch.

Add Customized Watch Faces:

Keep the watch connected to your phone, open the Zepp app, go to Profile > Amazfit T-Rex 3 > Watch Faces > Custom Background. Tap your preferred style to change the background by selecting a photo from your phone's Albums or taking a photo with the camera.

Delete Watch Faces

To free up storage space, delete some watch faces (at least one must remain).

1. Wake up the watch face, then press and hold it to go to the watch face selection page.
2. Swipe left or right to preview available watch faces.
3. Swipe up on the screen to reveal the delete button (trash can icon), and tap it to delete the watch face.

State Points

A state point is displayed at the top of the watch face to indicate currently enabled functions, such as Theater Mode or the Countdown app running in the background.

Supported Display States:

• Low battery
• DND Mode
• Sleep Mode
• Theater Mode
• Stopwatch (tap the state point to go to the app)
• Countdown (tap the state point to go to the app)
• Music (tap the state point to go to the app)
• In workouts (tap the state point to go to the app)
• Charging

Notifications and Calls

App Alerts

Keep the watch connected to your phone to receive app alerts. On the watch face page, swipe right to view the latest 20 alerts in the Notification Center.

Setting Method:

Keep the watch connected to your phone, open the Zepp app, go to Profile > Amazfit T-Rex 3 > Notifications and Reminders > App Notifications to enable alerts for desired apps.

Note: For Android phones, add the Zepp app to the allowlist or auto-run list in the phone's background to ensure it runs continuously. If terminated, the watch will disconnect, and you won't receive notifications.

For iOS, the App alerts list initially has limited apps. More apps will appear as the phone receives notifications from them.

Clear All Notifications:

There is a button (trash can icon) at the bottom of the notification list to clear all notifications. Notifications are automatically cleared after the watch restarts.

To Delete a Single Notification:

When a notification is pushed, or after entering a notification from the list, it can be deleted via the delete button at the bottom.

Incoming Call Alerts

To enable this, open the Zepp app, go to Profile > Amazfit T-Rex 3 > Notifications and Reminders > Incoming Calls. When enabled and connected, the watch will display a prompt for incoming calls, allowing you to ignore or hang up the call.

Morning Updates

After enabling, the device sends a short report every morning upon waking, providing quick access to weather, sports health status, and personal affairs to help prepare for the day.

You can disable Morning Updates in Device > Settings > Preferences > Morning Updates. You can also adjust content and display order. These settings can also be managed via the Zepp app: Profile > Amazfit T-Rex 3 > Device Settings > Morning Updates.

Shortcuts

Shortcut Cards

Swipe up on the watch face to access the Shortcut Cards page, where you can easily use and view various features and information, such as latest events, next alarms, or recent BPM data.

You can also open the Zepp app and go to Profile > Amazfit T-Rex 3 > Shortcut Cards to set displayed content and order.

Press Buttons for Quick Start-up

Go to Watch > Settings > Preferences > Shortcut Buttons to select an app for quick launch. The set app can then be quickly opened by operating the corresponding button.

Triggering Methods:

• Long press SEL Button
• Press SEL Button
• Long press UP Button
• Long Press Down Button

Workouts

Workout Modes

The watch supports over 170 workout modes, including Running & walking, Cycling, Swimming, Outdoor workouts, Indoor workouts, Dance, Combat workouts, Ball workouts, Water workouts, Winter workouts, Extreme workouts, Leisure workouts, Board & card games, Diving, and Others.

Workout List

1. Select "Workouts" in the watch App list or press the upper right button on the watch face (if quick start-up is set for workouts) to go to the workout list.
2. Select the workout to start from the list.
3. Select "More Workouts" to view all workout modes and start a workout.
4. Tap the Edit button (plus sign icon) to edit the workout list, allowing you to add, delete, and sort workouts.

Select a Workout

In the workout list, swipe up or down or press UP/DOWN buttons to select the workout.

Start a Workout

For workouts requiring GPS positioning, the device automatically searches for a GPS signal upon entering the workout preparation page. A red status bar indicates signal search, turning green when found. It is recommended to tap the green status bar or the upper right button to start the workout after the signal is found for improved data accuracy.

For workouts not requiring positioning, you can directly tap the green status bar on the workout preparation page to start.

Workout Operations

Turn Pages During a Workout

During a workout, swipe up or down or tap the UP/DOWN buttons to turn pages. Swipe left or right to turn pages. On the left side of the workout data page, you can pause or end the workout. On the right side, you can control music playback on the phone.

Button Definitions During Workouts

1. Screen Locked
   • Tap UP/DOWN button to unlock.
   • Tap the SELECT button to pause/continue the workout and unlock.
   • Tap the BACK button during workouts to start a new lap/set and unlock.
   • Tap the BACK button during pause to toggle the operation page and data page and unlock.
   • Press and hold the BACK button to return to the watch face and run in background.
2. Screen Not Locked
   • Tap UP/DOWN button to turn pages.
   • Tap the SELECT button to pause/continue the workout.
   • Tap the BACK button during workouts to start a new lap/set.
   • Tap the BACK button during pause to toggle the operation page and data page.
   • Press and hold the BACK button to return to the watch face and run in background.

Workout Navigation Operations Page

On the left side of the workout data page, you can pause or end the workout.

1. Pause/resume: Tap to enter the workout pause/resume page.
2. Finish: Tap to end the current workout and save data.
3. Assistant: Tap to modify workout assistant settings (also modifiable when paused).
4. Resume later: Press to save current workout and return to watch face. Re-enter workout app to return to pause page.
5. More: Press to modify settings.

Screen Lock During Workout

When automatic screen lock is enabled, the touch screen locks, and a padlock icon is displayed when the screen turns off during exercise, enters AOD mode, or times out.

In this state, the touch screen cannot be operated. Unlock by pressing UP/DOWN buttons. Pressing SELECT or BACK buttons will also unlock while pausing or manually marking a lap.

During swimming workouts, the touch screen is continuously disabled and only re-enabled after pausing swimming via a button press.

During diving workouts, the touch screen is continuously disabled and only re-enabled after swimming ends.

Workout Settings

On the workout preparation page, swipe up and tap "Settings" to configure the current workout mode. Parameters vary by mode.

Workout Assistant

Provides auxiliary tools like workout goals, alerts, auto laps, auto pause, cadence assistant, and virtual pacer. Features vary by workout.

Workout Goals

Set goals for duration, distance, calories, and effect. The watch displays real-time progress and notifies upon achievement. Goals vary by workout.

Workout Alerts

Set reminders like distance, heart rate, etc. Alerts vary by workout.

1. Distance reminder: Watch vibrates and displays duration for each kilometer/mile. Set in Workout Mode > Workout Assistant > Workout Alerts > Distance.
2. Safe heart rate alert: Watch vibrates and displays a message if heart rate exceeds a set safe value. Slow down or stop. Set in Workout Mode > Workout Assistant > Workout Alerts > Safe Heart Rate.
3. Heart rate range alert: Watch vibrates and displays a message if heart rate is outside the configured zone. Adjust speed to stay within range. Set in Workout Mode > Workout Assistant > Workout Alerts > Heart Rate Zone.
4. Pace alert: Set maximum/minimum pace. Watch vibrates and displays a message if pace exceeds preset value. Set in Workout Mode > Workout Assistant > Workout Alerts > Slowest Pace.

Additional alerts supported: Fastest Pace, trips, speed, stroke frequency, cadence, time, calorie, drinking water, energy intake, return, rest period, altitude, and target height.

Auto Lap

Available for some workouts. Set auto lap distance in settings; watch reminds you each time the distance is reached. You can also manually start a lap with the lower right button. Watch records details for both manual and auto laps, viewable after workout. Set in Workout Mode > Workout Assistant > Auto Lap.

Auto Pause

Enable/disable auto pause. Workout automatically pauses if speed is too low and resumes when speed increases. Threshold can be customized. Set in Workout Mode > Workout Assistant > Auto Pause.

Virtual Pacer

Set a pace value for the virtual pacer to view current pace, lead/lag distance, and position relative to the pacer during workouts. Set in Outdoor Running/Treadmill > Workout Assistant > Virtual Pacer.

Cadence Assistant

Set cadence per minute and reminder frequency. Watch buzzes or vibrates according to set cadence to help control it. Set in Workout Mode > Workout Assistant > Cadence Assistant.

Smart Start

When enabled, on the exercise preparation page, if positioning is successful and workout state is detected, the watch intelligently and automatically starts and records the workout, preventing data loss. Setting steps: Specific workout mode (e.g., Outdoor running) > Assistant > Start intelligently > Enable.

Training

Training Template

Some sports use training templates, editable in Zepp app (Workout tab > More > Training > Training Template). Edit training steps, types, reminder content, cycle groups, etc., and synchronize to watch.

After syncing, open watch > Workout > Training > Training template, select, and click GO. The watch will follow the template, automatically jumping to the next stage.

Interval Training

Available for some workouts. Edit training stage, rest stage, and loops directly on the watch. Training performs according to settings, automatically advancing to the next stage. Edit stages and rest stages by distance, time, and loops, or in a customized way. Items for editing vary by workout. Setting steps: Open workout mode > Training > Interval training.

Navigation

Import Track to Watch

Upload GPX, TCX, KML track files to Zepp App, send to device, and view/use for navigation. Setup steps: Track file > open via Zepp app > Save track > Send to watch.

Save Current Location

In workout modes supporting navigation, current location coordinates can be saved and used. Setting steps: before/during workout > Navigation > Save current position.

Track Navigation

Select a target track or location point from "My Route" or "My location" to start navigation. The track page provides route guidance. This feature is only for some outdoor activities. Setup steps: Workout mode > Navigation > My Route/My location > Select Track > Start Navigation.

Turn by Turn Navigation

When route navigation is enabled, navigation alerts provide reminders at turns. Only for some outdoor activities. Setup steps: Workout mode > Navigation > Navigation settings > Navigation Reminder.

Altitude Overview

When using Track Navigation, the altitude overview page is automatically generated during workout, showing overall altitude change and current real-time position.

Slope Analysis

When using Track Navigation, if the route's altitude changes significantly, slope information is automatically analyzed and generated, marking the positional relationship between current position and slope.

Remarks: Not all track routes generate slope segment information; only those with large altitude fluctuations do.

Return to the Starting Point

Return to the starting point via navigation. Two methods: straight-line and original route (Backtrack). Only for some outdoor activities generating GPS tracks.

Straight Line Return

When enabled, the device's track page connects a straight line from current position to workout start point, guiding you back. Setting steps: Workout > Pause > Navigation > Back to start point > Straight-line return.

Remarks: Straight-line return is based purely on GPS location points and cannot account for impassable landforms like mountains, rivers, canyons, or buildings. Navigate according to actual situation.

Backtrack

When enabled, the device's track page navigates according to the route track you passed, returning to the start point by pressing track navigation. Setting steps: Workout > Pause > Navigation > Back to start point > Backtracking.

More

Edit Data Items

Edit data items during workouts, including workout data and charts, deleting, adding, or sorting data pages.

Optional data page formats: 1, 2, 3, 4, 5, or 6 data items per page.

Over 150 workout data items supported (specific items vary by workout).

Over 8 types of real-time charts supported, including pace, elevation, etc.

Up to 4 pages of workout extensions can be added.

Up to 10 pages of data/workout charts can be added.

3D Data Mode

Enable/disable for some workouts. If enabled, watch calculates distance using 3D data, considering altitude and slope changes for more accurate distance matching the actual route. If disabled, projection distance (2D) is calculated based on traversed route.

Wrist Side

For some workouts (e.g., tennis), wear the device on the hand holding the racket for more accurate workout data. If using the right hand for the racket, wear the watch on the right hand. Setup steps: Tennis/Rowing machine > Settings > More > Wrist side.

Swimming Pool Length

Refers to lane length. Watch calculates swimming data based on set lane length. Set corresponding lane length for each pool for accurate evaluation. Setting steps: Pool Swimming > Settings > More > Lane Length.

Recalibrate

In treadmill workout mode, calibrate according to actual distance after each exercise. Calibration with distance > 0.5 km helps watch learn running habits for more accurate distance recording. If significant difference persists after multiple calibrations, recalibrate. Setup steps: Treadmill > Settings > More > Recalibrate.

Down Swing Direction

For some workouts (e.g., golf), wear the device on the hand matching the golf swing direction for more accurate data. If down swing is left (hitting ball right to left), wear watch on left hand. Setting steps: Golf Swing > Settings > More > Down Swing Direction.

Runway Distance & Track Selection

In Track Run workout, set runway distance and track selection for more accurate data. Setting steps: Track Run > Settings > More > Track Run Settings > Runway distance & Track selection.

Real-time Performance

Assesses physical condition and performance during exercise. Higher value indicates better state. Effective in Outdoor Running and Track Run modes. Reminder pops up during exercise.

• Reminder timing: Reminders sent when data generated for first time and when range changes.
• Reminder condition: Data generated only after single workout reaches VO2 Max generation condition.

A Real-time Performance chart is displayed in workout record. Manually turn off via Outdoor running/Track run > Settings > More > Real-time Performance.

Real-time Performance Ranges and Their Meanings:

TE score is evaluated based on profile, heart rate, and speed. Low TE score doesn't mean a problem, but workout was too easy for significant aerobic improvement. Obtained when heart rate data is monitored; watch displays score and suggestions. Reviewable in workout records.

Workout Status

Includes current training load, full recovery time, and VO2max. Determined by profile and data like heart rate. Accuracy improves with continued use.

VO2 Max (Maximum Oxygen Uptake)

Indicates oxygen consumed during max-intensity workouts, a key indicator of aerobic capacity and prerequisite for high-level aerobic capacity in endurance athletes. A personal indicator, varying by gender and age. Watch evaluates capacity based on profile, heart rate, and speed. Changes with athletic capacity. Everyone has a VO2 Max value, varying by individual body conditions.

How is it obtained?

1. Correctly enter your profile in the app.
2. Start outdoor running or trail running for at least 10 minutes, ensuring heart rate reaches 75% of maximum.
3. After the run, view current VO2 Max in watch's workout record app or "See more statuses" screen.
4. VO2 Max values map to seven athletic ability levels: Novice, Elementary, Ordinary, Medium, Good, Excellent, and Superior.

How can I view it?

View current VO2 Max in watch's workout status app. Also view history and trends in the app.

Training Load

Calculated based on excess post-exercise oxygen consumption (EPOC). Higher score means longer workout time and greater intensity. Total training load over past 7 days represents body burden from recent workouts. Three ranges: low, moderate, high.

Low training load won't improve ability much. High/too high load can cause fatigue/injury. Recommended to keep training load in moderate range for continuous improvement within tolerance. Moderate range depends on recent/long-term workout data and improves accuracy with use.

How to obtain training load

Once workout mode is enabled, training load is obtained upon reaching minimum level. View past 7 days' training load in watch's workout status app. View historical load and trends in the app.

Total Recovery Time

Recommended time for complete body recovery. After each workout, recovery suggestions are based on heart rate to aid recovery and prevent injury.

Heart Rate After Workout

Device automatically measures heart rate within 3 minutes after workout end. Results displayed in heart rate chart section of Zepp app workout record. If next workout starts immediately, previous workout's Heart Rate after Workout measurement terminates. Delayed termination after pausing may affect accuracy.

To ensure timeliness and effectiveness of Heart Rate after Workout data measurement, it is recommended to: 1. End the workout timely. 2. Wear the watch properly within 3 minutes after workout end. 3. Wait at least 3 minutes after previous workout before starting next one.

Zepp Coach

Zepp Coach customizes a training plan based on workout history and exercise habits to improve athletic capacity and cardiorespiratory fitness while avoiding injuries.

1. Start a plan: Find Zepp App > Home > Zepp Coach card, click "Customize Plan," fill in past exercise situation (1-2 months), select rest day and start date.
2. View the plan: After setting up, view daily schedule in Zepp Coach app on device or in Zepp app > Home > Zepp Coach details page.
3. Set reminders: In Zepp Coach app on device, slide to rightmost page to set training reminders.
4. Execute the plan: Start workout via device's Zepp Coach app or Workout List. Records included in daily training statistics. Wear device during exercise to sync log to Zepp App.
5. Modify and terminate the plan: In Zepp app > Zepp Coach > Detail page, modify or terminate plan by clicking Settings button (gear icon) at top right.

Map

Map Download

1. Connect watch to WiFi.
2. Open Zepp App > Profile > Amazfit T-Rex 3 > Device App settings > Map.
3. Select download area and click "Add to device download List."
4. Confirm download on watch.

Using the Map

1. Once download is complete, map usage during workouts is turned on by default.
2. Select movement type with GPS positioning; map displays on real-time track page.

Troubleshooting:

1. Map download progress not updated: Related to network environment. If slow, switch network environment.
2. Map cannot be displayed during workout:
   • Confirm successful map download: check watch settings > Map > Map Resources.
   • Check "Show Base Map" switch in Settings > Map.
   • Confirm successful GPS positioning.
   • Ensure map resource of current location is downloaded.

Activities and Health

One-tap Measurement

Device supports heart rate, blood oxygen, stress, and breathing rate monitoring. Quickly check health indicators using One-tap measuring. Data saved under each feature's records.

Wake up watch, press BACK button on watch face to app list, swipe up/down to select/open "One-tap Measuring" app, then tap "measure."

Sleep

Sleep quality is vital for health. Wearing watch during sleep automatically records sleep info: nighttime sleep and naps. Sleep 0:00am-8:00am is night sleep; naps are >60 mins apart from night sleep. Naps <20 mins not recorded.

Wake up watch, press BACK button on watch face to app list, swipe up/down to select/open "Sleep" app. View night sleep duration, stages, score, etc. Naps and more info viewable after syncing to app. Setting Sleep app as shortcut card allows easy viewing of previous night's sleep status.

While connected, sleep settings also accessible in Zepp app: Profile > Amazfit T-Rex 3 > Health Monitor.

Sleep Plan

Set different sleep and wake times weekly. Device turns on sleep mode, reminds you to go to bed/wake up, and monitors sleep based on schedule, helping develop good habits.

Open Sleep app, swipe down to last page, enter sleep settings, click "sleep plan." Also set in Zepp app: Sleep page > Regularity > Sleep Schedule.

Assisted Sleep Monitoring

Open Sleep app, swipe down to last page, go to sleep settings to enable "assisted sleep monitor." If device detects you're wearing it during sleep, it automatically records more sleep data (e.g., REM stages).

Sleep Breathing Quality Monitoring

Open Sleep app, swipe down to last page, go to sleep settings to enable "sleep breathing quality monitoring." If device detects you're wearing it during sleep, it automatically monitors breathing quality for better understanding of sleep status.

While connected, also set in Zepp app: Profile > Amazfit T-Rex 3 > Health Monitor.

PAI

PAI measures physiological activity and reflects overall physical condition, calculated based on BPM, daily activity intensity, and physiological data.

Wake up watch, press BACK button on watch face to app list, swipe up/down to select/open "PAI" app. View past seven days' PAI score, today's score, and advice for higher score. Sync data to app for more info.

Maintaining certain intensity of daily activities/workouts yields PAI value. According to HUNT Fitness Study*, PAI above 100 reduces cardiovascular death risk and increases life expectancy.

* The HUNT Fitness Study is a sub-project of the HUNT study, led by Professor Ulrik Wisloff at the School of Medicine, Norwegian University of Science and Technology. It has lasted over 35 years and involved more than 230,000 participants.

Heart Rate

Heart rate is a key physical indicator. Frequent measurement captures changes and provides reference for healthy lifestyle. For accuracy, wear watch correctly, ensuring skin contact is clean and free of smear.

Wake up watch, press BACK button on watch face to app list, swipe up/down to select/open "Heart Rate" app. View most recent heart rate, all-day curve, resting heart rate, interval distribution, etc. Sync data to app for more info.

While connected, heart rate settings also accessible in Zepp app: Profile > Amazfit T-Rex 3 > Health Monitoring.

Manual Heart Rate Measurement

In Heart Rate app, tap the heartbeat symbol to manually measure. After successful measurement, device continues measuring if staying on screen.

Auto Heart Rate Monitoring

1. Open Heart Rate app, swipe up to last page, go to Settings > Auto Heart Rate Monitor to adjust monitoring frequency. Watch automatically measures heart rate at set frequency.
2. Enable activity detection to automatically increase measuring frequency during activity for more accurate recording of changes.

Heart Rate Alert

In resting state (except sleep), device notifies if heart rate goes above/below limit for 10 minutes.

1. When Auto Heart Rate Monitor frequency is 1 minute, heart rate alert enabled.
2. In settings for high/low heart rate alerts, adjust value or disable alerts.

Blood Oxygen

Blood oxygen is a vital physiological indicator of respiration and circulation.

Wake up watch, press BACK button on watch face to app list, swipe up/down to select/open "Blood Oxygen" app. View most recent blood oxygen value and all-day status. Sync data to app for more info.

While connected, blood oxygen settings also accessible in Zepp app: Profile > Amazfit T-Rex 3 > Health Monitor.

Manual Blood Oxygen Measurement

Tap the blood drop symbol to manually measure blood oxygen. After successful measurement, device continues measuring if staying on screen.

Auto Blood Oxygen Monitoring

Go to Blood Oxygen app, swipe up to Settings page to enable "Auto Blood Oxygen Monitor." In resting state, watch automatically measures blood oxygen and records changes throughout day.

Low Blood Oxygen Alerts

In resting state (except sleep), device notifies if blood oxygen falls below limit for 10 minutes.

1. After Auto Blood Oxygen Monitor enabled, enable "Low blood oxygen alerts."
2. In settings for low blood oxygen alerts, adjust value or disable alerts.

Precautions for SpO2 Measurement

1. Wear watch one finger distance from carpal and remain still.
2. Wear watch tightly; for best results, sensation of pressure.
3. Place arm on stable surface (e.g., table), screen facing up.
4. Remain still and focus during measurement.
5. Factors like hair, tattoo, shaking, low temp, incorrect wearing may affect results or cause failure.
6. Measurement range: 80%-100%. For reference only, not medical diagnosis. Seek professional medical advice if unwell.

Stress

Stress index calculated based on heart rate variability, reference for health status. Rest more when index is high.

Wake up watch, go to app list, swipe up/down to select/open "Stress" app. View most recent stress value, all-day status, interval distribution, and pressure status over last seven days. Sync data to app for more info.

While connected, stress settings also accessible in Zepp app: Profile > Amazfit T-Rex 3 > Health Monitor.

Manual Stress Measurement

In Stress app, tap the swirl symbol to manually measure stress. After successful measurement, device continues measuring if staying on screen.

Auto Stress Monitoring

Open Stress app, swipe up to last page, go to stress settings to enable "Auto Stress Monitoring." Automatically measures stress every five minutes, showing changes throughout day.

Stress Relief Reminder

In resting state (except sleep), device notifies if stress level goes above limit for 10 minutes.

1. After auto stress monitoring enabled, enable "Stress Relief Reminder."
2. In stress settings, enable "Stress Relief Reminder" to receive alerts.

Activity

Maintaining daily activity is crucial for physical health.

Wake up watch, go to app list, swipe up/down to select/open "Activity" app. Daily activity has three main indicators: activity (steps/calories), fat burning, and standing. View all-day activity distribution chart.

Watch automatically records other activity data: resting consumption, walking time, sitting time, floors climbed, distance. Viewable in Activity app.

Goal Notifications

Watch displays notification when any main daily activity indicator reaches target value.

1. Open Activity app, swipe up to last page, go to activity settings to enable "Goal notifications." While connected, also accessible in Zepp app: Profile > Amazfit T-Rex 3 > Notifications and Reminders > Goal Reach Notifications.
2. In Activity settings, set daily goals for steps and calories. While connected, also accessible in Zepp app: Profile > My Goals.

Standing Reminder

To reduce harm from sedentary behavior, watch encourages movement hourly while awake. Daily goal: active for 12 hours.

If no activity detected for >1 min during first 50 mins of an hour while awake, watch reminds you to move. Achieve standing goal by moving before next hour.

Open Activity app, swipe up to last page, go to activity settings to enable "Standing Reminder." While connected, also accessible in Zepp app: Profile > Amazfit T-Rex 3 > Notifications and Reminders > Standing Reminders.

Cycles

Tracking menstrual cycles helps understand physiological rhythms.

Wake up watch, go to app list, swipe up/down to select/open "Cycles" app. View menstrual cycle records and predictions. More info viewable after syncing to app.

Before using Cycles app, enter start time of most recent period, duration, and menstrual cycle duration. Also enter data in Zepp app and sync to watch.

While connected, settings also accessible in Zepp app: Cycles > Settings (two overlapping squares icon).

Manually Record the Menstrual Cycle

In Cycles Tracking app, tap the pencil on paper icon to record data:

1. If not recorded, tap to record start date of current period.
2. If recorded, tap to record end date of current period.
3. To extend period after set end time, tap record again within 30 days (if last period not ended), or sync data to app and modify.

Menstrual Cycle Prediction

Cycles app intelligently predicts period, fertile period, and ovulation day based on data. Not a substitute for contraception or medical advice.

Open Cycles app, swipe up to last page, enter menstrual cycle settings to start prediction.

Menstrual Cycle Reminder

Before period start, watch sends notification at 9:00 PM on set date.

1. When prediction enabled, enable "menstrual cycle reminder."
2. For menstrual period and ovulation day reminders set in Cycles app, adjust reminder date or disable.

Breath

Helps relieve stress by guiding slow, deep breathing.

Wake up watch, press upper button on watch face to app list, swipe up/down to select/open "Breath" app.

Multimedia Feature

Music Player

Supports playing local music stored on watch; requires Bluetooth headphones/audio.

1. Add music: Go to Zepp App > Profile > Amazfit T-Rex 3 > Music page, select .mp3 files from phone and transfer to watch. Play music on watch after transfer.

Note: For file transfer, connect to watch hotspot. Phone won't connect to other networks. Watch turns off hotspot after transfer; phone reconnects to previous network.

2. Music home page displays song name, composer, previous/next song, play/pause, play mode, volume adjustment, and "+" to collect songs.
3. Swipe up music home page to second page for music usage mode, song list, Bluetooth audio device connection, and other operations.

Music Remote Controller

Keep watch connected to phone. Control music playback (start/pause, previous/next song) on phone via watch's music app.

Modifying Settings on an Android Phone:

Keep watch connected. Start Zepp app, go to Profile > Amazfit T-Rex 3 > Notifications and Reminders. Tap "Access to read notifications not enabled" message to Notification Settings page, grant notification permission to Zepp app. If message not displayed, permission granted.

Note: For Android, add Zepp app to allowlist/auto-run list in background. If terminated, watch disconnects, no music control.

Watch Apps

Apps are separate watch features (e.g., workouts, heart rate, weather).

Wake up watch, go to app list, swipe up/down to browse, tap to start.

Alarm

Add up to 10 alarms in Zepp app and on watch. Supports repeat wake-up and smart wake-up (watch calculates best time to wake from light sleep within 30 mins before set time).

Watch buzzes/vibrates. Turn off or "Remind Me Later" (after 10 mins, up to 5 times per alarm). Default: reminds later if no operation.

Calendar

Keep watch connected to phone, open Zepp app, go to Profile > Amazfit T-Rex 3 > Calendar. Create/edit events. Sync up to 200 events for today and next 30 days. Zepp app reads phone's system calendar events, but app events don't sync to system calendar.

Tap calendar on watch to event list. Displays today's and next 30 days' events. Event reminder pops up; turn off or "Remind Me Later" (after 10 mins).

To-Do List

While connected, open Zepp app, tap Profile > Amazfit T-Rex 3 > To-Do List. Create/edit to-dos, set reminder time/repetition. Up to 60 to-dos.

At reminder time, to-do reminder pops up on watch; perform operations like "Done," "Remind me in 1 hour," "Remind me later," "Ignore."

Pomodoro Tracker

Manages time scientifically, sets concentration time in cycles. Balances work/breaks, minimizes interruptions, improves time management. Default: 25 min work, 5 min break. Create custom times. Watch enters DND mode during work time.

World Clock

In Profile > Amazfit T-Rex 3 > World Clock, add up to 20 cities in Zepp app, sync to watch to view real-time. Watch provides default cities for quick add.

Stopwatch

Times up to 23 hours, 59 minutes, 59 seconds with 0.01 sec accuracy. Counts up to 99 times. Records time difference between current and last counts.

Countdown

Provides 8 shortcuts for quick setup. Manually set timer up to 23 hours, 59 minutes, 59 seconds. Watch reminds when timer ends.

Camera Remote

Control phone camera remotely using watch.

For iOS, pair watch with phone's Bluetooth before use.

This feature is not currently supported on Android devices.

Weather

In Weather app, view:

• Today's weather (temp, temp curve, conditions, wind force, humidity).
• Daily life index (outdoor workouts, UV, fishing, car wash).
• 5-day forecast.

Weather data syncs via mobile network. Keep watch connected to phone for updates.

• Add up to 5 locations and temp units (Celsius/Fahrenheit) in Zepp app.
• View added locations on watch.

Sun & Moon

In Sun & Moon app, view:

• Sunrise and sunset time. Tap reminder button to enable/disable.
• Moonrise and moonset time, moon phase.
• For tides, view hourly tidal data in coastal/port areas.

Compass

Calibrate watch due to magnetic interference by rotating ball in Compass app. After calibration, bearing and angle pointed to by current 12 o'clock direction on watch face displayed.

Tap button to lock current 12 o'clock position. When direction changes, interface displays angle between new and previous 12 o'clock direction.

Barometer

In Barometer app, view:

• Air Pressure Page: Displays current barometric pressure and curve over last 4 hours. Enable storm alert and set threshold; system alerts on sudden pressure change.
• Altitude Page: Displays current altitude and curve over last 4 hours. Supports calibration via manual elevation input and positioning.

Membership Card

Add membership cards to watch:

1. Enter membership card page, click "Add," enter sweep page, scan QR code/barcode.
2. Alternatively, screenshot/photo barcode/QR code, save to phone album; click "Album," select image.
3. After scanning, enter name, number, choose color, click "Save."

Note for adding membership card:

• Limited storage: same account supports up to 20 cards.
• Currently supports Code 128, Code 39, QR code, UPC A, EAN 13, EAN 8.

App Installation and Uninstallation

Download/install more apps from app store.

1. Installing an app: With watch and phone connected, in Zepp app, go to Profile > Amazfit T-Rex 3 > App settings > More > Go shopping > App store, select target app to download/install or update.
2. Uninstalling an app: With watch and phone connected, in Zepp app, go to Profile > Amazfit T-Rex 3 > App store > Mine > More, tap "More" to app management page, tap delete button, select apps to uninstall.

Watch Settings

Low Temperature Mode

Watch enters low temperature mode when ambient temp is too low. Basic features maintained; some features unavailable. Go to Settings > Preferences > Automatic Low Temperature Mode.

Note: In low temperature mode, features including buzzer, touch screen, heart rate monitoring, and blood oxygen monitoring are not available.

Units

With watch connected to phone, open Zepp app, go to Profile > More > Settings. Set units for distance, weight, temperature. Watch automatically follows app settings during data sync.

Heart Rate Range Setting

Keep watch connected to phone, open Zepp app, choose Profile > Avatar > Heart Rate Zone to calculate heart rate zone based on max or reserved heart rate. Watch automatically follows app settings during data sync.

Time Format

Keep watch connected to phone. During data sync, watch automatically follows phone's system time and time format (12-hour or 24-hour). If 12-hour or 24-hour format selected on watch in Settings > Watch Face & Time, watch time format won't change with phone once set.

Date Format

Default date format: "year/month/day." Change to "month/day/year" or "day/month/year" in Settings > Watch Face & Time.

WIFI (Wireless LAN) Settings

Join wireless LAN in Watch > Settings > Wi-Fi. For password-protected networks, open Zepp app, select network on watch (while connected), enter password in app.

Bluetooth Settings

Pair with Bluetooth audio devices in Watch > Settings > Bluetooth.

Note: If paired Bluetooth device won't connect, cancel pairing status and re-pair.

Setting a Password

Set watch password in App List > Settings > Preferences > Off-wrist Lock. Watch automatically locks with password when not worn. Enter password to continue use.