JiuChoi 1S Bluetooth Smart Heart Rate Call Reminder Bracelet Waterproof IP66 Sport Heart Rate,Fitness Step Tracker,Sedentary Remind Functions Supports Smartphone Android 4.3 IOS 8.0 or Above Get continuous, automatic, wrist-based heart rate and simplified heart rate zones. Kindly contact JiuChoi 1S, Sedentary remind/Call Reminder/and more warmly function bring the better experience. See call notifications, daily stats and time of day on the OLED display. Oled smart touch screen design, easy access to every function. Waterproof Sweatproof IP67, can be used when shower etc. Record the daily exercise, Tracks steps, distance, calories burn and so on, make you exercise is more efficiently. Boasts up to 5 days battery life. Wristband App compatible with Bluetooth 4.0, Android 4.3, IOS 8.0 or higher os, please refer the User Manual before use.