Xiaomi Mi Band 3 Smart Bracelet with Heart Rate Monitor

Dimensions : Wristband body :17.9 x 46.9 x 12mm Total length of wrist strap :247mm Adjustable length of wristband1 :55 – 216mm Specifications : Battery capacity : 110mAh Standby time : approx. 20 days[1] Battery type : Li-Ion Polymer Battery Input voltage :DC 5.0V Input current :250mA Max Weightapprox. 20g (including wristband) Body material : plastic IP rating :5ATM[2] Operating temperature :-10℃～50℃ Screen size :0.78 inches Display resolution : 128 x 80 Sensors : 3-axis accelerometer and PPG heart rate sensor Wireless connectivity : Bluetooth 4.2 BLE Setting requirements :Phones with Bluetooth 4.0 and Android 4.4 or iOS 9.0 or higher Models that support the unlock function : models running MIUI systems on Android 4.4 or higher or Android 5.0 or higher and which support the Smart Lock function Wrist strap material : thermoplastic elastomer Buckle material : aluminum alloy Features : Displays the time : displays incoming call/rejects instant messages (What’ app, Facebook etc.) Inactivity alerts: provides inactivity alerts event reminders Vibrating alarm : do not disturb mode follow friends and family Automatic step counter : phone unlock event reminders Sleep monitor : phone locator heart rate monitor Weather forecast : goal setting the notification of messages Calorie counter :  speed reminders mileage Dial replacement : notification browsing timer Setting display items :low battery reminders multiple ways to wear Can be worn while swimming : screen lock OTA upgrade