1. Introduction
This manual provides detailed instructions for setting up, operating, and maintaining your Lefitus I39H Smart Watch. This device is designed to enhance your daily life with features like Bluetooth calling, fitness tracking, health monitoring, and smart notifications. Please read this manual carefully to ensure proper use and optimal performance.
2. What's in the Box
Upon unboxing your Lefitus I39H Smart Watch, please verify that all the following components are included:
- Smart Watch (with Gold Steel Strap)
- 2 x Silicone Straps (Pink & Light Purple)
- Charging Cable
- User Manual
- Connection Card

Image: All components included in the Lefitus I39H Smart Watch package.
3. Getting Started
3.1 Charging the Smart Watch
Before first use, fully charge your smart watch. Connect the magnetic charging cable to the charging points on the back of the watch and plug the USB end into a power adapter (not included) or a computer USB port. A full charge typically takes approximately 2 hours and provides 3-7 days of usage depending on feature use.
3.2 App Download and Installation
To unlock the full potential of your smart watch, download the FitCloudPro app on your smartphone.
- Turn on the Bluetooth function on your phone.
- Open Google Play Store (for Android) or App Store (for iPhone).
- Search for "FitCloudPro" and download the app. Alternatively, scan the QR code provided in the connection card or visit http://fitcloud.hetangsmart.com/qrcode/.
- Open the app. You can choose to register an account or proceed with guest login.

Image: Visual guide for FitCloudPro app download and initial setup.
3.3 Pairing the Smart Watch
After installing the app, follow these steps to pair your watch:
- In the FitCloudPro app, navigate to the 'Device' section.
- Click 'Search now' or 'Add Device'.
- Find 'I39H' in the list of discovered devices and click to bind.
- Confirm the pairing request on both your phone and the watch.
Video: A detailed guide on how to connect the smart watch to your smartphone via the FitCloudPro app.
3.4 Enabling Bluetooth Call Function
To use the Bluetooth call feature, an additional connection is required:
- Swipe down on your smart watch screen to access the quick settings. Tap the 'Call' function icon (headphone icon) to turn it on.
- Return to your phone's Bluetooth settings.
- Under 'Other Devices' or similar, find 'Watch Call' and click it to connect.
- Once connected, you can use your watch to make and receive calls directly.
Video: Demonstrates the Bluetooth call function and how to enable it on the smart watch.
4. Operating Instructions
4.1 Basic Navigation
The Lefitus I39H Smart Watch features a 1.32-inch HD touch screen for easy navigation. Swipe left/right or up/down to access different functions and menus. The watch supports multiple menu styles for personalized experience.
4.2 Bluetooth Call and Music Control
With its advanced Bluetooth chipset, the watch allows you to make and receive phone calls directly from your wrist. You can also control music playback on your connected smartphone, making it convenient during workouts or daily activities.
4.3 Smart Notifications
Receive alerts for SMS, calls, and various social media apps such as Facebook, Twitter, WhatsApp, Skype, Instagram, and more directly on your watch. Ensure 'Push Notifications' are enabled in the FitCloudPro app for desired applications.

Image: Message reminder and Bluetooth dial call features shown on the smart watch.
4.4 Customizing Watch Faces
Personalize your watch with over 200 free dials available in the FitCloudPro app. You can also upload your favorite pictures to create custom watch faces that reflect your style.

Image: Custom watch face feature and IP67 waterproof rating.
4.5 Fitness Tracking and Sports Modes
The watch accurately records all-day activities including steps, distance, and calories burned. It supports 20 sports modes such as walking, running, yoga, cycling, basketball, climbing, and soccer. All data can be synchronized to the app for scientific analysis and goal achievement.

Image: Overview of the 20 sports modes available on the smart watch.
4.6 Daily Physical Health Monitoring
Equipped with a built-in optical heart rate sensor and intelligent algorithms, the watch monitors your heart rate, blood oxygen levels, and sleep quality. You can view your all-day measurement records in the FitCloudPro app to understand your physical health and make necessary adjustments.

Image: Health monitoring features including blood pressure and heart rate tracking.
4.7 Other Practical Functions
The Lefitus I39H Smart Watch offers a variety of additional features:
- Camera Control: Remotely control your phone's camera.
- Find Phone: Locate your misplaced phone.
- Sedentary Reminders: Get alerts to move after periods of inactivity.
- Alarm Clock: Set alarms directly from your wrist.
- Stopwatch: For timing activities.
- Weather Forecast: Get real-time weather updates.
- Flashlight: Use the watch screen as a light source.
- Menstrual Cycle Reminders: Track and predict menstrual cycles.
5. Maintenance
5.1 Waterproof Rating
The Lefitus I39H Smart Watch has an IP67 waterproof rating, meaning it is resistant to splashes, rain, and brief immersion in water. It is suitable for daily life use such as hand washing or light rain. Do not use it for swimming, showering with hot water, or diving.
5.2 Cleaning and Care
To maintain your watch's appearance and functionality:
- Wipe the watch and straps regularly with a soft, dry cloth.
- If exposed to sweat or water, clean and dry the watch thoroughly to prevent skin irritation and corrosion.
- Avoid exposing the watch to extreme temperatures or harsh chemicals.
5.3 Battery Care
To prolong battery life:
- Avoid fully discharging the battery frequently.
- Charge the watch regularly, even if not in constant use.
- Store the watch in a cool, dry place when not in use for extended periods.
6. Troubleshooting
6.1 Connection Issues
- Ensure Bluetooth is enabled on your phone and the watch.
- Make sure the watch is within the Bluetooth range of your phone.
- Restart both your phone and the watch.
- If the issue persists, unbind the device from the app and your phone's Bluetooth settings, then re-pair.
6.2 Inaccurate Data
- Ensure the watch is worn snugly on your wrist, not too loose or too tight.
- Keep the sensor clean and free from debris.
- Update the FitCloudPro app to the latest version.
6.3 Short Battery Life
- Reduce screen brightness.
- Limit the number of apps sending notifications to the watch.
- Turn off continuous heart rate monitoring if not needed.
- Ensure the watch is fully charged each time.
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | I39H |
| Brand | Lefitus |
| Screen Size | 1.32 Inches |
| Shape | Round |
| Waterproof Rating | IP67 |
| Battery Capacity | 270 mAh Lithium Ion |
| Battery Life | 3-7 days (typical use) |
| Charging Time | Approx. 2 hours |
| Connectivity | Bluetooth 5.0 |
| Compatible OS | Android 4.4 and above, iOS 8.8 and above |
| Item Weight | 8.4 ounces |
| Product Dimensions | 2 x 0.39 x 0.39 inches |
8. Warranty and Support
Lefitus provides a 12-month warranty for this product. For any questions, technical support, or warranty claims, please contact Lefitus customer service. We are committed to providing 24/7 online customer service.

Image: Lefitus Customer Support information.



