SUPOW(TM) Bluetooth 4.0 Smart Bracelet/Fitness Wristband/Sports Pedometer/Sleep Tracker/Heart Rate Monitor with OLED Display Screen for Windows/MAC/IOS/Android Heart rate intelligence bracelets using bluetooth technology, 4.0 low power consumption, implement the data with computer, mobile phone synchronization, compatible with Windows, MAC, iOS and Android system Adopt BOSCH 3 d acceleration sensor, accurate records of your movement data Using Advanced electrode type touching monitor heart rate and Save the electrocardiogram, Real-time transmission electrocardiogram (ec). Movement patterns: steps can accurate records (including walking and running), calories, distance, time, moving target yield rate, etc.) Sleep patterns: monitoring the sleep quality and sleep. Heart rate pattern: science movement, sweet reminders