Invtepy IP67 Water Resistant Bluetooth Exercise Smart Watch Bracelet Black Watch Compatible Requirements For the Phones: ios 6.1+ version, Android 4.3+ version Bluetooth 4.0+Version TW64 will record your step, distance and calorie, which can help you to set the target Smart reminder: In-call reminder, sedentary reminder, drinking reminder, wake up alarm etc Help you to keep a good habit, health and happiness follow you. Main Function: Passometer, Distance measuring, Calorie consumption management, Sleep management, Event trigger, Clock, Sedentary reminder, Anti-lost, Remote camera, Vibration alarm clock.