Bluetooth Version: Bluetooth V2.0, Talk Time: about 3 hours, Charging Time: about 1 hour, Music Play Time: about 6 hours, Standby Time: about 160 hours.;Ambient Noise: ﾃ｢ﾂ可､75dB, Transmitting Range: ﾃ｢ﾂ可･10m, Range of Frequency: 2.4GHz spectrum, Language Support: English, Chinese.;Material: Steel + Silicon, Bluetooth Protocol: A2DP + HFP 1.5 + HS P 1.2, Power Supply: Built-in 230mAh rechargeable battery.;Operate your phone's main functions from your wrist, Stopwatch function, Support hands-free calls, Time / Date / Week / Battery state display, Answer or Dial calls from your wrist,Ringing reminder when you receive a call.;Android System can support all function in the description. BUT Iphone IOS only support:Passometer,Calendar,Call Sync,Calculator,Clock,Stopwatch.More options Please search WindMax US Store front. USPS Shiping from CA,USA .