Features: Skin-closed material, comfortable and safe to wear. 0.86inch OLED HD high sensitive touch screen display. BLE 4.0 ultra-low power BT chip, excellent performance. IP67 life waterproof level. (swimming and taking shower not suggestion) 50mAh lithium ion battery capacity, long standby time. Compatible with iOS 7.1 above or Android 4.4 above devices. Functions: Activity Tracking(Step pedometer, Calorie Burnt, Distance), Automatic Sleep monitoring, Call alert, Message alert, Alarm clock alert, Goal complete alert, Sedentary alert, Low-battery reminder, Anti-lost alert, Remote Camera Control, Activity Data Sharing and etc.