Original Xiaomi Mi Band 2 Heart Rate Monitor Smart Wristband with OLED Display Black Fitness Tracker: Monitor your activity levels, sleep patterns, and more with Mi Band 2 which can record your steps, distance, pace, calories burned and active minutes, and sync its data via Bluetooth 4.0 to the Mi Fit app Smart Reminder: When your phone receives calls, messages or other notifications such as from Facebook, Mi Band 2 will vibrate to remind you. Simply lift your arm to view the notification icon on the display screen with caller name/ID when you receive a call Sleep Monitor: MI Band 2 can monitor your whole sleep cycle, automatically recognize the stage of sleep (deep or light sleep) via heart rate monitoring, record the data and duration of every stage accurately, and help to analyze and improve your sleep quality IP67 Water-Resistant Wristband Watch: MI Band 2 is durable and resistant against water splashes, sweat, cosmetics, dust and more. You dont need to worry when doing daily routines, even when washing hands or taking a shower Compatibility: Support for Bluetooth 4.0 and above, Android 4.4 and above and iOS 7.1 and above iOS. Install MI Fit app to get instant statistics and set alarms, notification alerts, and other functions