VERTTEE Wireless Bluetooth Smart Bracelet with Heart Rate Monitor Step Pedometer Fitness Tracker Main function: RTC,Heart rate monitor,Step pedometer,Calorie burnt,Distance track, Sleep monitor,Call remind(caller name/caller ID),Alarm remind,Anti-lost,Camera remote control Life Waterproof: This fitness bracelet remains watertight throughout the life of the part obtained such as briefly hold under water (showering / washing hands) Built heart rate monitor: Get precise heart rate information, without having to wear a chest strap Be synchronous with the app "Veryfit 2.0" app (for iOS 7.0 or later & Android 4.3 or higher. Download APP "Veryfit 2.0" Apple Store or Google Play) Long battery life of only a charge up to one week