BT 4.1 Version provides high-speed date transmission and stable performance.High quality speaker makes the bass powerful, brings you perfect music enjoyment.Press the power button for 3 sec, you call spell or say the number loudly to use this function, your phone must support this function.Only weight 13.5 grams, it is easy to carry around. Even wear it for a long time, you will not feel tired and neck pain.Support hands-free call function, just click one button instead of your hands to answer, reject or hang up the call.BT Version: BT 4.1+EDRPower Consumption: Talk 19.04-22.13mAhMusic Play 16.35-22.56mAhTransmitting Distance: 7-10 metersTalk Time: About 4 hoursStandby Time: About 120 hoursBattery Type: 55mAh 3.7V Lithium Battery 501214Color: Black, Black&Red(Optional)Earphone Cable Length: 63cm/24.8inItem Size: Approx. 2.5*2.0*2.0cm/0.98*0.78*0.78inItem Weight: 13.5g/0.47ozPackage Size: Approx. 13.5*11*2.5cm/5.31*4.33*0.98inPackage Weight: 27.5g/0.96oz1* BT Earphone1* Charging Cable1* Chinese-English Manual