1. Introduction and Overview
The Gravity C25 Smartwatch is designed to offer a comprehensive blend of style, functionality, and durability. Featuring a vibrant 1.43-inch AMOLED display with Always-On Display (AOD) capability, it provides clear visuals and intuitive touch interaction. This smartwatch is built for active individuals, offering extensive health and fitness tracking, smart connectivity, and robust protection against environmental elements.
Key features include:
- 1.43" AMOLED Display with Always-On Mode: High-resolution 466x466 display for vibrant colors and sharp visuals, with AOD for quick glances.
- Advanced Health & Fitness Tracking: 24/7 heart rate monitoring, sleep tracking, step counting, and blood oxygen monitoring.
- 100+ Sports Modes & AI Voice Assistant: Comprehensive tracking for various activities and hands-free control.
- Bluetooth Calling & Smart Notifications: Make and receive calls directly from your wrist, and get alerts for messages and apps.
- Rugged & Weather-Resistant Design: 1 ATM waterproof, dustproof, shockproof, and resistant to extreme temperatures (-24°C to 60°C).
- Long Battery Life & Universal Compatibility: Up to 25 days of standby time with a 410mAh battery, compatible with Android and iOS via the Da Fit app.

Figure 1.1: The Gravity C25 Smartwatch, showcasing its round display and rugged design with orange accents.

Figure 1.2: An overview of the Gravity C25 Smartwatch's key features, including its 1.43-inch AMOLED screen, 1 ATM waterproof rating, 100+ sports modes, and compatibility with the Da Fit app.
2. What's in the Box
Upon unboxing your Gravity C25 Smartwatch, please ensure all the following items are present:
- Gravity C25 Smartwatch
- Charging Cable
- User Manual (this document)
3. Setup Guide
3.1 Initial Charging
Before first use, fully charge your Gravity C25 Smartwatch. Connect the magnetic charging cable to the charging points on the back of the watch and plug the USB end into a compatible power adapter (not included) or a computer's USB port.
- Align the magnetic charging pins with the contacts on the back of the watch.
- Ensure a secure connection. The watch display will indicate charging status.
- Allow approximately 2 hours for a full charge.
3.2 App Installation and Pairing
The Gravity C25 Smartwatch pairs with your smartphone via the Da Fit app. This app is essential for managing settings, tracking health data, and customizing watch faces.
- Download the Da Fit App: Search for "Da Fit" in the Apple App Store (for iOS devices) or Google Play Store (for Android devices), or scan the QR code provided in the watch's quick start guide.
- Create an Account: Open the Da Fit app and follow the on-screen instructions to create a new account or log in.
- Enable Bluetooth: Ensure Bluetooth is enabled on your smartphone.
- Pair the Device:
- In the Da Fit app, navigate to the "Device" or "Add Device" section.
- The app will search for nearby devices. Select "C25" or "Gravity C25" from the list of found devices.
- Confirm the pairing request on both your phone and the smartwatch if prompted.
- Grant Permissions: Allow necessary permissions (e.g., location, notifications, contacts) for the app to function correctly.
Once paired, the watch will synchronize time and data with your phone.
4. Operating Instructions
4.1 Basic Navigation
- Touch Screen: Swipe left/right, up/down to navigate through menus and features. Tap to select.
- Side Buttons: The watch features two physical buttons.
- Top Button (POWER): Press to wake/sleep the screen, return to the home screen, or long-press to power on/off.
- Bottom Button (SPORT): Press to quickly access the sports modes menu.
4.2 Display and Watch Faces
The 1.43-inch AMOLED display offers vibrant visuals. The Always-On Display (AOD) feature allows the time and essential information to remain visible without activating the full screen.
- Changing Watch Faces:
- On the watch, long-press the home screen to cycle through pre-installed watch faces.
- For more options, open the Da Fit app, navigate to "Watch Faces" or "Dial Settings" to browse and download additional designs.
- Always-On Display (AOD): Enable or disable AOD through the watch settings or the Da Fit app. Note that AOD may impact battery life.

Figure 4.1: Close-up view of the Gravity C25's 1.43-inch AMOLED HD screen, highlighting its display quality and resolution.

Figure 4.2: A selection of customizable watch dials available for the Gravity C25 Smartwatch, demonstrating the variety of display options.
4.3 Bluetooth Calling and Notifications
The C25 allows you to make and receive calls directly from your wrist and receive smart notifications.
- Bluetooth Calling:
- Ensure the watch is connected to your phone via Bluetooth.
- In the Da Fit app, enable the "Bluetooth Call" feature. You may need to pair the watch as a separate audio device in your phone's Bluetooth settings (e.g., "C25_CALL").
- To make a call, access the dial pad or contacts on the watch. To answer, tap the green icon when a call comes in.
- Smart Notifications:
- In the Da Fit app, go to "Notifications" and enable notifications for desired apps (e.g., SMS, WhatsApp, social media).
- Notifications will appear on your watch screen. Swipe up from the home screen to view your notification history.
4.4 Health and Fitness Tracking
The Gravity C25 provides comprehensive health monitoring and fitness tracking features.
- Heart Rate Monitoring: The watch continuously monitors your heart rate. View real-time data on the watch or detailed historical data in the Da Fit app.
- Blood Oxygen (SpO2) Monitoring: Measure your blood oxygen levels on demand. Access this feature from the watch's health menu.
- Sleep Tracking: Wear the watch to bed to track your sleep patterns, including deep sleep, light sleep, and awake times. Analysis is available in the Da Fit app.
- Step Counting and Activity: The watch automatically tracks your daily steps, distance, and calories burned.

Figure 4.3: Illustration of the Gravity C25's scientific sleep monitoring capabilities, showing sleep stages and data analysis.

Figure 4.4: Visual representation of the Gravity C25's smart blood oxygen and 24-hour heart rate monitoring features, including data display and sensor location.
4.5 Sports Modes and AI Voice Assistant
- 100+ Sports Modes:
- Press the "SPORT" side button or navigate through the watch menu to access the sports modes.
- Select your desired activity (e.g., running, cycling, swimming, hiking) to start tracking. The watch will record duration, calories, heart rate, and other relevant metrics.
- End your workout by swiping or pressing the appropriate on-screen button. Data will sync to the Da Fit app.
- AI Voice Assistant:
- Ensure your watch is connected to your phone and the voice assistant feature is enabled in the Da Fit app.
- Access the AI voice assistant from the watch's menu. Speak your commands (e.g., "What's the weather?", "Set a timer").
5. Maintenance and Care
To ensure the longevity and optimal performance of your Gravity C25 Smartwatch, follow these maintenance guidelines:
- Cleaning: Regularly wipe the watch screen and body with a soft, lint-free cloth. For stubborn dirt, slightly dampen the cloth with water. Avoid harsh chemicals or abrasive materials.
- Water Resistance (1 ATM): The C25 is 1 ATM waterproof, meaning it can withstand splashes, rain, and brief immersion (e.g., showering, shallow swimming). It is not suitable for diving or high-pressure water activities. After exposure to water, especially saltwater, rinse with fresh water and dry thoroughly.
- Temperature Resistance: The watch is designed to operate in temperatures ranging from -24°C to 60°C. Avoid exposing it to extreme temperatures outside this range for prolonged periods.
- Shock and Dust Resistance: While rugged, avoid unnecessary drops or impacts. Keep the charging contacts clean and free of dust.
- Strap Care: Clean the silicone strap regularly with mild soap and water to prevent skin irritation and maintain hygiene.

Figure 5.1: The Gravity C25 Smartwatch demonstrating its 1 ATM water resistance, suitable for swimming and other water activities up to 10 meters depth.

Figure 5.2: Visuals illustrating the Gravity C25's durability features, including resistance to extreme cold, high temperatures, dust, and drops, making it suitable for harsh environments.
6. Troubleshooting
If you encounter issues with your Gravity C25 Smartwatch, refer to the following common problems and solutions:
| Problem | Possible Solution |
|---|---|
| Watch does not turn on | Ensure the watch is fully charged. Long-press the POWER button for several seconds. |
| Cannot pair with smartphone |
|
| Notifications not received |
|
| Inaccurate health data |
|
| Short battery life |
|
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | W4-C28 |
| Display | 1.43 Inches AMOLED, 466x466 resolution |
| Battery Capacity | 410 mAh Lithium Polymer |
| Standby Time | Up to 25 days |
| Connectivity | Bluetooth |
| Water Resistance | 1 ATM (10 meters) |
| Operating System | Android OS (compatible with iOS and Android devices via Da Fit app) |
| Temperature Resistance | -24°C to 60°C |
| Dimensions (Package) | 9 x 4 x 1 inches |
| Item Weight | 1 pounds (16 ounces) |
| Manufacturer | Gravity |
8. Warranty and Support
For warranty information and technical support regarding your Gravity C25 Smartwatch, please refer to the official Gravity website or contact their customer service directly. Details are typically available on the manufacturer's packaging or official product pages.
Manufacturer: Gravity
For the most up-to-date support resources, please visit the product page on Amazon or the official Gravity brand website.





