Oittm Smart Sport Watch with Heart Rate Monitor, Calorie Counter, Fitness Activity Tracker & Running Exercise Timers, Alarm, El Backlight, Chronograph and Stopwatch with Medical Silicone Gel Strap Smart Digital Watch (Blue) Heart Rate Monitor: Monitor the heart rate change when you move in real time , adjust the exercise intensity more conveniently , control the heart rate change in different sports. Personal information set: Before doing the exercise, in the heart rate watch input personal information, the maximum and minimum heart rate, choose exercise intensity, to help you better movement. Calorie Counter: According to the set of personal information and heart rate can measure the movement of calories, in order to better adjust the intensity. 5 Main Modes: Time Mode; Pedometer; Exercise Timer; Memory; Settings NOTE: Please Dry you hand/finger when you test heart rate, More functions using problem, please refer to the User manual, or Contact us directly.