1. Introduction
Welcome to the LEADOYS C31 GPS Smartwatch user manual. This guide provides detailed instructions on how to set up, operate, maintain, and troubleshoot your new smartwatch. Please read this manual carefully to ensure optimal performance and longevity of your device.

2. Key Features
- Multi-Six-Star Positioning System (GPS): Track your location in real-time for outdoor activities.
- Bluetooth Phone Call: Answer and make calls directly from your wrist.
- 50-Meter Waterproof: Suitable for swimming and daily water exposure.
- 24/7 Health Monitoring: Includes Heart Rate Monitor, Blood Oxygen Monitor, Sleep Monitor, Blood Pressure Monitor, and Stress Monitor.
- Activity Tracking: Steps Tracker, Calorie Tracker, and Activity Tracker.
- 100+ Sports Modes: GOMORE Advanced Algorithm for accurate sports analysis, including running, cycling, swimming, and more.
- 6-Axis Gyroscope: High-precision sensor for subtle wrist movements and directional changes.
- Long Battery Life: >450mAh battery capacity, up to 30 days of battery life.
- Voice Assistant Built-in: For convenient hands-free operation.
- Multiple Dials: Customize your watch face.
- Display: 1.45-inch TFT screen with 360*360 resolution.
- Additional Functions: Shock Resistant, Passometer, Mood Tracker, Message Reminder, Call Reminder, Remote Control, Push Message, Chronograph, Alarm Clock, World Time, Calendar, Calculators.
3. Package Contents
Upon opening the package, please ensure all items are present and in good condition:
- LEADOYS C31 Smartwatch
- Charging Cable
- User Manual

4. Setup Guide
4.1 Charging the Smartwatch
- Connect the charging cable to the charging port on the back of the smartwatch.
- Plug the other end of the charging cable into a USB power adapter (not included) or a computer's USB port.
- The watch display will indicate charging status. Ensure the watch is fully charged before first use.
4.2 Installing the DaFit App
The LEADOYS C31 Smartwatch requires the DaFit app for full functionality, including detailed health and workout insights, custom watch faces, and updates.
- Scan the QR code provided in the physical user manual or on the watch screen (if available) to download the DaFit app.
- Alternatively, search for "DaFit" in your device's app store (Google Play Store for Android, Apple App Store for iOS).
- Install the DaFit app on your smartphone. The app is compatible with iOS 9.0 and above, and Android 5.0 and above.

4.3 Pairing with Your Smartphone
- Ensure Bluetooth is enabled on your smartphone.
- Open the DaFit app and follow the on-screen instructions to create an account or log in.
- In the app, navigate to the device pairing section (usually indicated by a watch icon or "Add Device").
- The app will search for nearby devices. Select "C31" or the corresponding device name when it appears.
- Confirm the pairing request on both your smartphone and the smartwatch.
- Once paired, the watch will sync time and data with your phone.
5. Operating Instructions
5.1 Basic Navigation
- Touchscreen: Swipe left/right, up/down to navigate through menus and features. Tap to select.
- Side Buttons: The watch typically has one or more physical buttons.
- Power Button: Usually located on the right side. Press and hold to power on/off. Short press to return to the watch face or wake the screen.
- Sport Button: Often labeled "SPORT" or with a sport icon. Short press to access sport modes.
- Custom Button: Often labeled "CUSTOM". May be programmable via the app for quick access to a favorite feature.
5.2 Making and Receiving Calls
The C31 Smartwatch supports Bluetooth phone calls when connected to your smartphone.
- Answering Calls: When a call comes in, the watch will display the caller ID. Tap the green answer icon on the watch screen to answer.
- Making Calls: Access the dialer or contact list on your watch (if enabled via the app) to initiate a call.
5.3 Health Monitoring
The smartwatch continuously monitors various health metrics. Ensure the watch is worn snugly on your wrist for accurate readings.
- Heart Rate Monitor: Provides real-time heart rate data. View trends in the DaFit app.
- Blood Oxygen Monitor (SpO2): Tracks blood oxygen levels. The watch may vibrate to alert you if levels are too low. Keep the screen facing up and wear the sensor tightly for accurate readings.
- Sleep Monitor: Automatically tracks sleep quality, including real-time heart rate monitoring, breathing analysis, and sleep stages.
- Blood Pressure Monitor & Stress Monitor: Provides estimates of blood pressure and stress levels.


5.4 Activity and Sports Tracking
The watch supports over 100 sports modes and uses a Multi-Six-Star Positioning System (GPS) for accurate outdoor tracking.
- Starting a Workout: Press the "SPORT" button or navigate to the sports modes menu. Select your desired activity (e.g., Outdoor Run, Cycling, Swimming).
- GPS Tracking: For outdoor activities, ensure GPS is enabled. The watch will acquire a satellite signal before starting.
- Data Analysis: During and after workouts, the watch displays metrics like heart rate, pace, distance, calories burned, and stride data. Detailed analysis is available in the DaFit app.
- GOMORE Advanced Algorithm: Improves data accuracy by 60% in complex environments and provides multi-data fusion for high-performance workouts.




5.5 Emergency Features
- SOS Mode: Set emergency contacts in the DaFit app. Press the Power button 5 times to trigger SOS.
- Hydration Alert: Smart detection of dehydration risk with vibration alerts to help maintain performance.
- Goal Reminder: Notifies you when you reach activity goals.

6. Maintenance and Care
6.1 Cleaning Your Smartwatch
- Wipe the watch screen and body with a soft, lint-free cloth.
- For stubborn stains, dampen the cloth slightly with water. Avoid using harsh chemicals or abrasive materials.
- Clean the charging contacts regularly to ensure proper charging.
6.2 Water Resistance
The LEADOYS C31 is 50-meter waterproof, suitable for swimming and daily water exposure. However, it is not recommended for diving or high-pressure water activities.
- Draining Water: After exposure to water, shake the watch to quickly eject water from the speaker and microphone holes. You may also shake and tilt the watch to help get the water out.

6.3 Battery Care
- Avoid extreme temperatures, which can degrade battery life.
- Charge the watch regularly, but avoid leaving it fully charged or fully discharged for extended periods.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Watch not turning on | Low battery | Charge the watch for at least 30 minutes. |
| Unable to pair with phone | Bluetooth off, app not open, watch not discoverable | Ensure Bluetooth is on, DaFit app is open, and the watch is in pairing mode. Restart both devices. |
| Inaccurate health data | Loose fit, dirty sensors | Ensure the watch is worn snugly on the wrist. Clean the sensors on the back of the watch. |
| No notifications | App permissions, notification settings | Check DaFit app notification settings and phone's app permissions for DaFit. Ensure Bluetooth is connected. |
| GPS not locking on | Poor signal, indoor use | Move to an open outdoor area with a clear view of the sky. Wait a few minutes for GPS acquisition. |
8. Specifications
| Feature | Detail |
|---|---|
| Brand Name | LEADOYS |
| Model | C31 |
| Category | Smart Watches |
| Display Size | 1.45 inch |
| Screen Material | TFT |
| Resolution | 360*360 |
| Bluetooth Version | 5.3 |
| Waterproof Grade | 50m |
| Battery Capacity | >450mAh |
| Battery Life | Up to 30 days |
| RAM | 128 MB |
| ROM | 256 MB |
| Metrics Measured | Heart Rate Monitor, Women's Health Monitoring, Blood Oxygen Monitor, Sleep Monitor, Blood Pressure Monitor, Stress Monitor |
| Activity Tracked | Steps Tracker, Calorie Tracker, Activity Tracker |
| Voice Assistant | Yes |
| GPS | Yes (Multi-Six-Star Positioning System) |
| Multiple Dials | Yes |
| Compatibility | All Compatible (iOS 9.0+, Android 5.0+) |
| Languages | English, Russian, Spanish, Polish, Portuguese, Turkish, Italian, French, German, Korean, Japanese, Ukrainian, Arabic |
| Package Dimensions (approx.) | Length: 15 cm, Width: 10 cm, Height: 3 cm |
| Package Weight (approx.) | 0.2 kg |
9. User Tips
- For optimal GPS performance, ensure you are in an open area with a clear view of the sky when starting outdoor activities.
- To maximize battery life, consider adjusting screen brightness and turning off unnecessary notifications.
- Regularly sync your watch with the DaFit app to ensure all your health and activity data is backed up and analyzed.
- Experiment with different watch faces available in the DaFit app to personalize your smartwatch experience.
- If you experience any issues with water draining from the speaker/mic after swimming, gently shake and tilt the watch as instructed.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the official LEADOYS website or contact the seller directly. Keep your purchase receipt as proof of purchase.