1. Introduction
The Xiaomi Mijia Smart Watch K66- is a versatile sports and fitness smartwatch designed for men, featuring a robust build and a wide array of functionalities. It includes a 1.85-inch IPS HD screen, Bluetooth calling, comprehensive health monitoring, multiple sports modes, and a powerful 730mAh battery for extended use. This manual provides essential information for setting up, operating, and maintaining your smartwatch.

2. Important Safety Information
- Initial Charge: Please charge the watch for 2-4 hours before its first use.
- App Connection: Before using, scan the QR code provided in the manual (or on the watch packaging) to download the 'FitCloudPro' APP and connect it to your watch.
- Health Data Disclaimer: The data provided by the heart rate monitor and blood pressure functions are for daily reference only. They cannot be compared with professional medical devices and should not be used for medical diagnosis or treatment.
- Water Resistance: The watch has a life waterproof rating of IP67. This means it is resistant to splashes, rain, and can be worn while washing hands or doing housework. However, diving and bathing are not supported and will cause damage to the watch. Water damage to the watch does not qualify for warranty service.
3. Setup Guide
3.1 Charging the Smart Watch
Before first use, ensure your smartwatch is fully charged. Connect the magnetic charging cable to the charging contacts on the back of the watch and plug the USB end into a power adapter (not included) or a computer's USB port. A full charge typically takes 2-4 hours.

3.2 App Installation and Pairing
- Download the App: Scan the QR code provided in the product packaging or manual to download the 'FitCloudPro' application on your smartphone. The app is compatible with Android 4.4+ and iOS 8.0+ systems.
- Enable Bluetooth: Ensure Bluetooth is enabled on your smartphone.
- Open App and Pair: Open the 'FitCloudPro' app, navigate to the device section, and search for your smartwatch. Select the K66- model to initiate pairing. Follow any on-screen prompts to complete the connection.
4. Operating Instructions
4.1 Basic Navigation
The smartwatch features a 1.85-inch IPS full round touch screen with a resolution of 360*360 pixels. Swipe across the screen to navigate through menus and functions. Use the physical buttons on the side for power, back, or quick access to specific features.

4.2 Bluetooth Call Functionality
The K66- smartwatch supports Bluetooth calls, allowing you to answer or dial calls directly from your wrist. It features a high-fidelity AAC waterproof speaker for clear audio. This is particularly useful during sports or driving, enabling hands-free communication.

4.3 Flashlight Function
The watch includes a built-in flashlight function. Activate it through the watch interface to provide illumination in dark environments, useful for outdoor activities or finding items in low light.

4.4 Sports Modes and Activity Tracking
The smartwatch supports over 110 sports modes, including mountain climbing, cycling, and swimming. It provides real-time monitoring of important data such as heart rate, distance, speed, and calorie consumption during your workouts. Use the 'FitCloudPro' app to push and manage your preferred sports modes.



4.5 Health Monitoring
The K66- smartwatch offers 24-hour health monitoring, including heart rate, blood pressure, blood oxygen saturation, and sleep tracking. It uses a PPG biological tracking optical sensor to help you understand your physical condition throughout the day. Remember, this data is for reference only and not for medical use.


4.6 Sleep Quality Monitoring
The smartwatch automatically monitors your sleep patterns at night, intelligently identifying and recording your deep sleep, light sleep, and wakefulness. It quantifies your sleep quality to help you improve your rest.

4.7 Other Features
The K66- smartwatch offers a variety of additional functions:
- Voice Assistant: Integrated voice assistant for convenient control.
- Calculator: Basic calculator function.
- Alarm Clock: Set alarms directly from your wrist.
- Stopwatch: For timing activities.
- Music Control: Control music playback on your connected smartphone.
- Weather Display: Get real-time weather updates.
- Remote Camera: Use your watch as a remote shutter for your phone's camera.
- Sedentary Reminder: Alerts you to move after periods of inactivity.
- Vibration Adjustment: Customize vibration settings.
- Multiple Dials: Choose from a variety of watch faces to personalize your device.

Video 1: Smartwatch Features Overview
5. Maintenance
5.1 Water Resistance Guidelines
The K66- smartwatch is rated IP67 life waterproof. This means it can withstand splashes, rain, and brief immersion in shallow water (up to 1 meter for 30 minutes). It is suitable for daily activities like washing hands or doing dishes. However, it is NOT designed for swimming, diving, hot showers, or saunas. Exposure to hot water, steam, or prolonged submersion can damage the device and will void the warranty.

5.2 Cleaning and Care
- Regularly clean the watch screen and strap with a soft, dry cloth.
- If the watch comes into contact with sweat, soap, or other liquids, rinse it with clean water and dry it thoroughly.
- Avoid exposing the watch to extreme temperatures or harsh chemicals.
5.3 Battery Care
To maximize battery life and ensure optimal performance:
- Charge the watch using the provided magnetic charger.
- Avoid completely draining the battery frequently.
- Store the watch in a cool, dry place when not in use for extended periods.
6. Troubleshooting
If you encounter issues with your Xiaomi Mijia Smart Watch K66-, please refer to the following common solutions:
- Watch not turning on: Ensure the watch is fully charged. Connect it to the charger for at least 30 minutes.
- App connection issues:
- Check if Bluetooth is enabled on your smartphone.
- Ensure the 'FitCloudPro' app has the necessary permissions (location, Bluetooth, notifications).
- Try restarting both your watch and smartphone.
- If the watch is already paired with another device, disconnect it first.
- Inaccurate health readings: Ensure the watch is worn snugly on your wrist, about one finger's width from your wrist bone. Avoid excessive movement during measurements. Remember, health data is for reference only.
- Notifications not appearing: Check app notification settings on both your phone and the 'FitCloudPro' app. Ensure the app is running in the background and not being restricted by battery optimization settings.
7. Specifications
| Feature | Specification |
|---|---|
| Brand Name | XIAOMI |
| Model | K66- |
| App Name | FitCloudPro |
| Bluetooth Version | 5.0 |
| CPU Model | Realtek8773EWE-VP |
| Screen Material | IPS |
| Display Size | 1.85 inch |
| Resolution | 360*360 |
| Battery Capacity | 730mAh |
| Battery Life | 7-10 days (work time), 40 days (standby time) |
| Waterproof Grade | Life Waterproof (IP67) |
| System Compatibility | Android 4.4+ / iOS 8.0+ |
| Memory (ROM/RAM) | <128MB / <128MB |
| Case Material | Alloy |
| Band Material | Silica Gel |
| Voice Assistant Built-in | Yes |
| Metrics Measured | Heart Rate Monitor, Blood Oxygen Monitor, Sleep Monitor, Blood Pressure Monitor |
| Activity Tracked | Steps Tracker, Calorie Tracker, Activity Tracker |
| Supported Languages | English, Chinese, Japanese, German, French, Spanish, Arabic, Russian, Ukrainian, Portuguese |


8. User Tips
No specific user tips from reviews or Q&A were available for this product. However, general tips for smartwatches include:
- Optimize Battery: To extend battery life, reduce screen brightness, limit background app refresh, and turn off unnecessary notifications.
- Regular Sync: Sync your watch with the 'FitCloudPro' app regularly to ensure all your health and activity data is saved and updated.
- Firmware Updates: Check the 'FitCloudPro' app periodically for any available firmware updates for your watch. Updates can improve performance and add new features.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the seller or refer to the official product website. Keep your proof of purchase for any warranty claims. Please note that water damage due to improper use (e.g., diving or bathing) is not covered under warranty.





