TopSun Bluetooth 4.0 Wireless Smart Bracelet Heart Rate & Sleep Monitor Fitness Tracker Pedometer with OLED Display for Android 4.4+, IOS 7.1+ (Red) Monitor your sleep quality and heart rate automatically. For the heart rate is a real-time data, you need keep your smartphone connect with your bracelet to monitor your sleep, and synchronous data to APP the same day, the previous day's data will be deleted. Multifunction: Pedometer, calorie consumption, distance calculation, sleep monitoring,with heart rate monitor function,remote camera control,find phone, anti lost reminder (mobile phone out of range, call reminder, caller ID,time display,silent vibration alarm) Waterproof: IP67, Never mind your smart bracelet get wet in raining days, but remember do not worn in the shower Blutooth: 4.0 version bluetooth,using international first-line sensor,it will be a good one has accurate data synchronization,miss no in-calling and accurate calculation of sport and sleep specification. and please make sure the wrist band is fully charged and kept at the available distance of 5 meters. OLED Display: 0.49" Blue Screen, see call notifications, daily heart rate and time of day on the OLED display