EIISON Fitness Tracker with Heart Rate monitor E5S Activity Watch Step Walking Sleep Counter Wireless Wristband Pedometer Exercise Tracking Sweatproof Sports Bracelet for Android and iOS Heart Rate Monitor --- Get continuous, automatic, wrist-based heart rate and simplified heart rate zones OLED Screen --- With 0.49 inch OLED Screen Display, Mini vibration alerts motor, See call notifications, daily stats and time of day. Multi - Function --- SMS Reminding, Call Reminder, Incoming Calls Show, Reminders to move Auto sleep monitoring --- Accurate analysis of the sleeping quality , make you have a better understanding of the effects of sleep Compatibility --- Samsung HTC Huawei Nokia Etc all kinds of smart device which have bluetooth function, Android 4.4 or above, IOS7.1 and above,bluetooth 4.0 and above