1. Introduction
Welcome to the COLMI C81 Smartwatch user manual. This guide provides detailed instructions on how to set up, operate, and maintain your new smartwatch. The COLMI C81 features a stylish and durable design, crafted from high-quality military-grade zinc alloy. It boasts a large 2.0-inch AMOLED display, supports Bluetooth calls, offers over 100 sports modes, and includes comprehensive health monitoring features. Please read this manual carefully to ensure optimal performance and longevity of your device.

Figure 1: COLMI C81 Smartwatch in Black and White/Orange variants.
2. Package Contents
Upon unboxing, please verify that all the following items are included:
- COLMI C81 Smartwatch
- Charger Cable (Magnetic charging)
- User Manual (Paper)
- Protective Film
3. Specifications
The COLMI C81 Smartwatch is engineered with advanced technology to provide a seamless user experience. Key specifications are detailed below:
| Feature | Detail |
|---|---|
| Main Chipset | Realtek RTL8763EWE-VP |
| Display Type | 2.0'' Ultra HD AMOLED Display (Supports Always-on Modes) |
| Display Resolution | 410*502 pixels, 345 PPI, Up to 1000 nit Brightness |
| Battery Capacity | 250 mAh |
| Battery Life (Typical Use) | Up to 7 Days |
| Battery Life (Battery Saver) | Up to 20 Days |
| Waterproof Rating | IP68 Professional Waterproof |
| Bluetooth Version | 5.0 |
| Operation | Full screen touch + Rotate button |
| App Name | FitCloudPro |
| System Compatibility | Android 5.0+ or iOS 9.0+ |
| Band Width | 22mm |
| Weight | 57g |
| Case Material | Alloy |
| Band Material | Silica Gel |
| Screen Shape | Square |
| Voice Assistant | Built-in |
| Multiple Dials | Yes |
| Band Detachable | Yes |
| Certifications | CE, FCC, RoHS |

Figure 2: Product dimensions of the COLMI C81 Smartwatch. Dimensions are 47mm x 40mm x 11mm, with a wrist strap length of 265.8mm.
4. Setup Guide
4.1 Charging the Smartwatch
Before first use, fully charge your COLMI C81 Smartwatch. Connect the magnetic charging cable to the charging points on the back of the watch and plug the USB end into a power source.
- Use a low-power adapter (e.g., 5V/1A) or a laptop/PC USB port for charging.
- Avoid using fast-charging adapters, as this may damage the watch battery over time.

Figure 3: The COLMI C81 Smartwatch showing charging status and battery life information (up to 7 days daily use, 30 days basic standby).
4.2 App Installation and Pairing
- Download the "FitCloudPro" app from your smartphone's app store (compatible with Android 5.0+ or iOS 9.0+).
- Open the FitCloudPro app and follow the on-screen instructions to create an account or log in.
- Ensure Bluetooth is enabled on your smartphone.
- In the app, search for your COLMI C81 device and initiate the pairing process.
- Confirm the pairing request on both your smartphone and smartwatch.
5. Operating Instructions
5.1 Basic Navigation
The COLMI C81 features a full-screen touch display and a rotatable button for navigation.
- Touch Screen: Swipe left, right, up, or down to navigate through menus and notifications. Tap to select items.
- Rotate Button: Press the top button to return to the home screen or wake the display. Rotate the button to scroll through lists or zoom in/out on certain interfaces. The bottom button can be customized for various functions.

Figure 4: Multiple menu styles available for selection on the COLMI C81 Smartwatch, offering convenient daily collocation.
5.2 Display Features
- AMOLED Display: Enjoy a clear and vibrant 2.0-inch display with 410*502 resolution, 345 PPI, and up to 1000 nit brightness, ensuring readability even in sunlight.
- Always-On Display (AOD): The watch supports AOD, allowing you to quickly check the time without fully waking the screen.
- Custom Watch Faces: Personalize your watch by choosing from a wide variety of watch faces in the FitCloudPro app's watch face market, or set your favorite picture as a custom watch face.

Figure 5: Detailed view of the 2.0" Ultra clear AMOLED display, highlighting its wide color gamut, super wide viewing angle, and precise color accuracy.

Figure 6: The Always On Display feature of the COLMI C81 Smartwatch.
5.3 Bluetooth Call Functionality
The COLMI C81 supports dual-mode smart Bluetooth calls, making communication convenient.
- Answering Calls: When an incoming call is received, you can answer or reject it directly from your watch.
- Dialing Calls: Use the watch's dial pad or access your phone book and call records to make calls.
- Voice Chat: Enjoy hands-free voice chat anytime, anywhere.

Figure 7: The Bluetooth call feature on the COLMI C81 Smartwatch, showing contact lists and call records.
5.4 Health Monitoring
Your smartwatch is equipped with advanced sensors for comprehensive health tracking.
- Heart Rate Monitor: Continuously monitors your heart rate 24/7. The professional optical sensor automatically collects heart rate data every half hour, providing real-time protection for your heart.
- Blood Oxygen Monitor: The latest generation optical SpO2 sensor uses red light for accurate blood oxygen saturation detection.
- Sleep Tracker: Accurately monitors your sleep stages (deep, light, REM, awake) to help you understand and improve your sleep quality.
- Other Health Features: Breathe exercises, drink water reminders, reminder to move, and women's physiological cycle tracking. All data can be synced with the FitCloudPro app.

Figure 8: Intelligent Heart Rate Monitoring on the COLMI C81, showing the optical sensor on the back of the watch.

Figure 9: Blood oxygen monitoring interface on the COLMI C81, displaying SpO2 data and levels.

Figure 10: Accurate sleep monitoring feature of the COLMI C81, showing sleep duration and stages.
5.5 Sports Modes and Activity Tracking
The COLMI C81 supports over 100 sports modes and provides detailed activity tracking.
- Activity Tracking: Tracks steps, calories burned, and distance throughout the day.
- 100+ Exercise Modes: Select from a wide range of sports modes including Walking, Running, Hiking, Cycling, Basketball, Badminton, Soccer, Yoga, and many more.
- Sports Data Report: During exercise, you can check your exercise time, distance, number of steps, calorie consumption, and heart rate change. Set exercise goals and view daily and weekly step data.

Figure 11: Professional sports analysis on the COLMI C81, displaying exercise data such as steps, calories, and distance.
5.6 AI Voice Assistant
Utilize the built-in AI voice assistant for hands-free control and quick information access.
- Connect via Bluetooth to use voice commands.
- Give instructions to the watch to perform various tasks, simplifying your daily interactions.

Figure 12: The AI voice assistant feature of the COLMI C81 Smartwatch in action.
5.7 Other Convenient Functions
- Messages Reminder: Receive notifications for incoming news and calls.
- Alarm Clock & Timer: Set alarms and use the timer function.
- Weather Monitoring: Get weather forecasts and display time.
- Music & Camera Remote: Control music playback and remotely take pictures from your smartphone.
- Find Phone: Locate your paired smartphone.
- Calculator: A basic calculator function is available.
- Do Not Disturb Mode: Silence notifications during specific times.

Figure 13: Overview of convenient functions including weather monitoring, sedentary reminder, and drink water reminder.
6. Maintenance
6.1 Cleaning and Care
- Regularly clean your smartwatch and strap with a soft, dry cloth.
- Avoid using harsh chemicals or abrasive materials, as these can damage the device.
- Ensure the charging contacts are clean and dry before charging.
6.2 Waterproof Guidelines
The COLMI C81 Smartwatch has an IP68 professional waterproof rating, meaning it is resistant to dust and can withstand immersion in water up to 1.5 meters for 30 minutes. It is suitable for daily activities such as sweating during sports or exposure to rain showers.

Figure 14: Demonstration of the COLMI C81 Smartwatch's IP68 domestic waterproofing.
Important Precautions:
- Do NOT use the smartwatch in saunas, hot water, or ocean water. High temperatures and saltwater can compromise the waterproof seals.
- While you can wear the smartwatch in a swimming pool, it is not recommended to actively use its functions or press buttons while submerged.
- After exposure to water, ensure the watch is thoroughly dried before charging.
7. Troubleshooting
Here are solutions to some common questions and issues you might encounter:
- Q: Does the product have an Always-On Display function?
- A: Yes, the COLMI C81 supports Always-On Display.
- Q: Does the watch support Korean language?
- A: The watch itself does not have Korean language support, but the companion FitCloudPro app supports Korean.
- Q: What is the size of the bracelet?
- A: The width of the strap is 22mm.
- Q: Which adapter should I use to charge my watch?
- A: Please use a low-power adapter (e.g., 5V/1A) or plug the charging cable into a laptop or PC USB port. Do not use a fast-charging adapter as it may damage the watch in the long run.
- Q: Is this watch waterproof?
- A: Yes, it has an IP68 rating, meaning it can go underwater up to a depth of 1.5m for up to 30 minutes. However, avoid saunas, hot water, and ocean water.
- Q: Can it be used while swimming?
- A: You can wear the smartwatch in the swimming pool, but it is not recommended to actively use its functions or press buttons while swimming.
8. User Tips
- To prolong your smartwatch's battery life, always use a low-power adapter or a computer's USB port for charging.
- While the watch is IP68 waterproof, avoid exposing it to extreme conditions like saunas, hot water, or saltwater to maintain its integrity.
- Explore the FitCloudPro app's watch face market and custom watch face options to personalize your device.
- Regularly sync your health and activity data with the app to keep track of your progress and insights.
9. Warranty and Support
For any product-related inquiries, technical support, or warranty claims, please contact the official COLMI customer service or refer to the seller's support channels. Keep your purchase receipt as proof of purchase.





