ParameterSpecificationHeadscarf MaterialPolyesterBluetooth Version5 2Bluetooth ProtocolAGHSPBluetooth SolutionBlue MessageBluetooth Transmission Distance10 metersHeadphone ChannelStereo 2 0 Music Playback TimeMaximum sound 8H Medium volume 10 hoursMicrophone Distance1 meterBluetooth Standby Time72HBattery Capacity150ma hBattery Power0 55WSpeaker Impedance32 ohmsSpeaker Power0 02WFrequency Range2 4 2 4835GHzSensitivity45dbTransmission Power6dBAudio Output Distortion0 6 Audio Output Signal to Noise Ratio93dBCharging Time1 2 hoursMaximum Input VoltageDC 5VMaximum Input Current150mahMaximum Input Power0 55W