A good product, a comfortable shopping will make you happy! Welcome to the store, there are many other products you may need, you may wish to take a moment to browse, thank you! Highlights: * 1.3 inch resolution 240 * 240 screen * Hardware platform: NORDIC NRF52832 * Built-in 380mAh battery,working time about 7 days, standby time about 100 days * IP68 waterproof and dustproof * Heart rate monitor * Smart calls & messages reminder: Call, Twitter, Facebook, Wechat etc, all will be sent to wrist display and with vibration alertions * A variety of sports patterns, APP operation view pedometer,calories,distance * Support iOS 8.0 version above and Android 4.4 version above * More function: Sleep monitor,Heart rate monitor, Movement Monitor (steps,distance,calories), Pedometer, Message sync, Incoming call, Alarm clock,vibration Note: Wearable devices monitors human activities through electronic sensors,and they are at the consumer electuonics level.It’s normal for certain deviation.The user should treat data objectively. Please do not compared to hospital equipment about reading,it is NOT a medical device ! Before using, scan the QR code on the manual to download the app and connect it to the watch with APP.