SEFREE Bluetooth 4.0 Smart Fitness sport Tracker Wristband for ios and andorid ,Black(call reminder,Waterproof,Pedometer,Wireless Activity and Sleep Monitor) Scan QR code of the package ,download the app(ios or android) The sleep monitoring: deep sleep/shallow sleep, monitoring your sleep duration and sleep quality, no Sound alarm clock wake you up, won't make so much noise at the same time to the people around, STEP Motion control, meter, movement range, calorie consumption, The interface: nokia standard, DC2.0, Bluetooth 4.0 , Sensors: Kiniox, 3-axis MEMS Precision Sensors , Display: 0.91-inch OLED, 128 * 32 Wristband for Android 4.3 and IOS 7.0 or later.Support Chinese,English,Spanish,Deutsch,Russian,Hebrew,Etc