Heart Rate activity tracking: ZoiyTop smart bracelet can track you 24h real time heart rate monitoring. Including Recording Multi-sport modes, Heart Rate Monitor, Pedometer, Calories Counter, Distance, Connected GPS, Guided breathing, Fitness level of heart and lung, Multiple watch face style switch , All-day activities recording, Auto sleep tracking. Through the data you can adjust your own day activities Powerful functions: It will remind you when your receives a phone call/SMS/SNS, Facebook, Twitter, YouTube, WhatsApp and other SMS notifications and etc. it also display Alarm clock/Weather/Sedentary Reminder/Date/Time Remote Control Phone Camera/Music: With this function you can easy control your phone to take photo/listening to music any place any time without hold you phone Quick Charge/Long time Standby: Simply insert it into USB port of computer or power bank. About 1-2 hours can be full charged, standby time 10-15 days Widely Compatibility: App supports most smart phones with Bluetooth 4.0 or above. Support iOS 7.1 like iPhone7/7 plus/6/6s/6s Plus/5 or above(not for iPad)For the connect problem, there need to download APP, not directly connect . For the missing bracelet, one was free bend, will ask factory to check more carefully one bye one to make no any missing next time. Will ask factory to improve the accurate try their best.