Product information:Working voltage: 3.3V-4.2VBattery capacity: 45mA/350mAStandby time: about 60 hoursTransmission range: 2.40GHz-2.48GHzCommunication distance: effective distance of 15 metersSpeaker type: titanium composite membraneSize Information:Size: 72x38x30mmPacking list:Headphone X1