Activity tracker, wireless multifunctional watch BT 4.0, 1.44" LCD touchscreen, battery 55 mAh 3.7V, working distance up to 10 m, compatible with iOS 9.0 (or higher) and Android 5.0 (or higher), USB rechargeable, functions: heart rate monitor, blood pressure monitor, blood oxygen monitor, calories counter, pedometer, sleep monitor, APP notify, messages and calls notify, camera remote, alarm, vibration, time and date, anti-lost function