Using this Active Pro Call+III Smart Watch is a breeze. First, pair it with your phone via Bluetooth. Make sure your phone's OS meets the requirements (iOS 8.2 or above, Android 4.4 or above). Once paired, you can start making BT calls and playing BT music. To track your fitness, simply choose the appropriate sport mode from the menu. The heart rate monitor will work automatically during your workout to give you real - time data. The calorie calculation and track map will help you analyze your exercise results. The stopwatch can be used for timing short - term activities. When it comes to languages, you can switch between different ones in the settings. As for maintenance, keep the watch clean with a soft, dry cloth. Avoid exposing it to extreme temperatures or water for a long time. If you encounter any problems, try restarting the watch or unpairing and then pairing it with your phone again.