PHtronics Bluetooth Smart Watch for IOS, Android, Symbian, Blackberry OS and Windows Phone Android System can support all function in the description; IOS device and other device such as iPhones only support: Pedometer, Calendar, Call Sync, Calculator, Clock, Stopwatch. Battery with high voltage of 3.7V lithium ion polymer and high-capacity,208 hours of standby time,upto 4 hours of talk time Some functions require install APK on Android and wont work on IOS Device Android Supports Functions: Sync, Passometer, Calculator, Stopwatch, Alarm Clock, Anti-lost Alarm, Barometer, Thermometer, Sleep Monitoring, Music Player, Call History, Set Time/Date, SMS, MMS, Wechat, QQ, and Remote Camera.