1. Introduction
This manual provides detailed instructions for the setup, operation, and maintenance of your SUNKTA Military Smart Watch EF10-B. Designed for durability and functionality, this smartwatch offers extensive health monitoring, diverse sports modes, and convenient communication features compatible with Android and iOS devices.

Figure 1: SUNKTA Military Smart Watch EF10-B, showcasing its robust design and various display options.
2. What's in the Box
Verify that all items are present in the package:
- Smart watch ×1
- Stainless steel strap ×1
- Silicone strap ×1
- Magnetic charging line ×1
- 2-year warranty card ×1
3. Setup
3.1. Charging the Smart Watch
Before initial use, fully charge the smartwatch. The 800mAh battery provides over 15 days of usage and more than 45 days of standby time. A full charge typically takes 2 hours.
- Connect the magnetic charging cable to the charging points on the back of the watch.
- Plug the USB end of the cable into a 5V-1A USB power adapter (not included) or a computer's USB port.
- The watch display will indicate charging status.

Figure 2: The 800mAh battery provides extended usage. Use a 5V-1A adapter to avoid potential damage.
3.2. App Installation
To unlock the full potential of your smartwatch, install the companion app, 'Da Fit', on your smartphone.
- Scan the QR code provided in the user manual or on the watch itself to download the 'Da Fit' app.
- Alternatively, search for 'Da Fit' in the Apple App Store (for iOS) or Google Play Store (for Android) and install it.
3.3. Device Pairing
Pair your smartwatch with the 'Da Fit' app via Bluetooth for seamless data synchronization and feature control.
- Ensure Bluetooth is enabled on your smartphone.
- Open the 'Da Fit' app and follow the on-screen instructions to create a profile and add a new device.
- The app will search for available smartwatches. Select 'EF10' or 'AK75' (depending on the model identifier) from the list.
- Confirm the pairing request on both your smartphone and the smartwatch.
- Allow necessary permissions for notifications and location tracking to enable all features.

Figure 3: Step-by-step guide for connecting your smartwatch to the 'Da Fit' app.
Video 1: Demonstrates the pairing process and initial setup of the smartwatch with a smartphone.
4. Operating Instructions
4.1. Navigation
The smartwatch features a responsive 1.85-inch HD touchscreen and physical buttons for navigation.
- Swipe Up/Down: Scroll through menus and notifications.
- Swipe Left/Right: Access quick functions or different watch faces.
- Tap: Select an item or confirm an action.
- Side Buttons: Use for power on/off, menu access, or quick function shortcuts (customizable via settings).
4.2. Watch Face Customization
Personalize your smartwatch with a variety of watch faces.
- On the Watch: Long-press the current watch face to enter the selection mode. Swipe left or right to browse pre-installed faces.
- Via Da Fit App: Open the app, navigate to 'Watch Face' or 'Dial Settings'. Choose from nearly 300 online UIs or upload your own photo to create a custom dial.

Figure 4: Customize your watch face from hundreds of options or create your own.
4.3. Bluetooth Calling & Message Notifications
Stay connected with Bluetooth 5.2 for stable calls and instant notifications.
- Making/Answering Calls: After pairing, use the watch's dial pad or contact list to make calls. Answer incoming calls directly from your wrist using the built-in 60-decibel speaker and noise-canceling microphone.
- Message Notifications: Receive alerts for text messages, Facebook, WhatsApp, TikTok, and other apps directly on your watch display. Enable specific app notifications in the 'Da Fit' app settings.
- Voice Assistant: Use voice commands to control your phone via the watch.

Figure 5: Seamless Bluetooth calling and message notifications on your wrist.
Video 2: Overview of the smartwatch's 1.85-inch display and key features, including Bluetooth calls.
4.4. Health Monitoring
The smartwatch continuously monitors your health metrics.
- Heart Rate: Real-time 24/7 heart rate monitoring.
- Blood Oxygen: Measure your blood oxygen levels throughout the day.
- Sleep Tracking: Monitors sleep duration and quality (deep sleep, light sleep, REM). View detailed reports in the 'Da Fit' app.
- Stress Monitoring: Helps manage your stress levels.
Note: Monitoring data is for reference only and not for medical use.

Figure 6: Personal health monitoring features including heart rate, SpO2, and stress levels.
4.5. Sports Modes & Fitness Tracking
Track your workouts and daily activity with over 120 sports modes.
- Built-in Modes: 20 pre-installed training modes for daily use.
- Additional Modes: Access over 100 additional sports modes via the 'Da Fit' app.
- Activity Tracking: Real-time display of calories burned, distance traveled, and steps taken.

Figure 7: Track your performance across over 120 professional sports modes.
4.6. Other Practical Functions
The smartwatch includes 20 practical functions for daily convenience:
- Weather forecast
- Voice assistant
- Alarm clock
- Stopwatch & Timer
- Music & Camera control
- Sedentary & water-drinking reminders
- Multi-language switching
- Phone search
- Brightness adjustment
- Do-not-disturb mode
- Screen timer
- Password setting
Video 3: Demonstrates various functions and features of the SUNKTA Smartwatch EF10-B.
5. Maintenance
5.1. Durability & Waterproofing
The smartwatch is built with special composite materials and a metal case, meeting military standards for sturdiness and durability. It has passed tests for salt-spray, rain, and impact, and can operate in extreme temperatures.
- 5ATM Waterproof: Suitable for swimming, hand washing, and exposure to rain and sweat.
- Important Note: It is not recommended to wear the smartwatch while taking a shower. The steam generated can severely affect the waterproof performance of the product.

Figure 8: Military-grade durability ensures reliability in various conditions.

Figure 9: IP68 waterproofing allows use in various water-related activities, excluding hot showers.
5.2. Changing Watch Straps
The smartwatch comes with two interchangeable straps: a stainless steel bracelet and a silicone strap.
- Use the provided bracelet replacement tool to remove the current strap by pushing the spring bar.
- Align the new strap with the watch lugs and insert the spring bar until it clicks into place.

Figure 10: The smartwatch includes both a stainless steel and a silicone strap for different styles.
6. Troubleshooting
- Watch not turning on: Ensure the watch is fully charged. Connect it to the magnetic charger and check for charging indication.
- Unable to pair with phone:
- Ensure Bluetooth is enabled on your phone and the watch is within range (within 0.5 meters).
- Restart both your phone and the smartwatch.
- Clear Bluetooth cache on your phone and try pairing again.
- Ensure the 'Da Fit' app has all necessary permissions enabled.
- Notifications not received:
- Check 'Da Fit' app settings to ensure specific app notifications are enabled.
- Ensure the watch is not in 'Do Not Disturb' mode.
- Verify Bluetooth connection is stable.
- Inaccurate health data: Ensure the watch is worn snugly on your wrist, not too tight or too loose. Clean the sensors regularly.
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | EF10-B |
| Screen Size | 1.85 Inches |
| Battery Capacity | 800 Milliamp Hours |
| Connectivity Technology | Bluetooth 5.2 |
| Operating System | Android/iOS compatible |
| Water Resistance | 5ATM |
| Product Dimensions | 3.94 x 1.97 x 0.98 inches |
| Item Weight | 0.035 ounces |
| Special Features | 1.85''HD large screen, 800MAH Battery, Bluetooth calls, notifications, 24-hour heart rate, oxygen, voice assistants, 100+ sport modes, stopwatch, health tracker, alarm clocks, timer, weather forecast, password lock, find watch & phone, calculator, 27 languages, pedometer, distance, calories, music&camera control, do not disturb mode, brightness setting |
8. Warranty & Support
SUNKTA offers a 2-year warranty for this product. For any questions or support needs regarding your smartwatch, please feel free to contact our professional customer service team through Amazon. We are available 24 hours online to help resolve any issues you encounter.

Figure 11: SUNKTA provides a 2-year warranty and 24-hour online customer service.



