COOLEAD Fitness Tracker Watch Activity Tracker with Heart Rate Monitor Smart Bracelet Health Tracker with Step Tracker Sleep Monitor Calorie Counter Pedometer Activity Trackerstep counting, calories burning and distance measuring, comprehensively collect your and storage excise data (for the latest 7 days), efficiently help you manage your sports activity. Heart Rate Monitor1. click to heart rate menu, and the heart rate inductor's green light on the back of the band is on. 2. Close the back of the band, the inductor to the muscle. 3. Read the number after 10 seconds. If it is not done in this way, the measure of HEART RATE maybe not correct. (Please note the heart rate data is for your reference, NOT for medical use). Call and Message ReminderIt will vibrate to alert you if your phone receives a phone call, SMS text and SNS messages including Facebook, Twitter, WhatsApp, Linkedin, Instagram, Messenger, etc Other FunctionsSleep monitor, Gesture-sensor control, Anti-lost, Camera remote control, Sedentary reminder, Vibration clock alarm, Multi-language. Technical Design0.49" OLED screen will automatically light up when you turn over hand, 5.5" - 7.6" adjustable silicon band fit for different wrist size, IP65 daily waterproof design.Compatible with Android 4.4 or above, iOS 7.1 or above,Bluetooth 4.0 or above