Black Smart Wrist Pedometer Watch Mate U8 Bluetooth For iPhone Android Samsung Bluetooth Version: Bluetooth V2.0 Talk Time: about 3 hours Android System can support all function in the description Power Supply: Built-in 230mAh rechargeable battery Ringing reminder,hands-free calls,Time / Date / Week / Battery state display, Play the music,Sync phone book/SMS/call history(only for android phone)