Product information:Bluetooth version: 5.0Bluetooth protocol: AGHSPBluetooth solution: LanxunBluetooth transmission distance: 10 metersHeadphone channel: stereo (2.0)Music playback time: maximum sound 7H, medium volume 10 hoursMicrophone distance: 1 meterBluetooth standby time: 72HBattery capacity: 150ma/hBattery power: 0.55WSpeaker impedance: 32 ohmSpeaker power: 0.02WFrequency range: 2.4-2.4835GHzSensitivity: 45dbTransmitting power: 6dBAudio output distortion: 0.6%Audio output signal-to-noise ratio: 93dBCharging time: 1-2 hoursMaximum input voltage: DC 5VMaximum input current: 150mahMaximum input power: 0.55WProduct packaging informationSize: 27cm*10cmPacking accessories: Bluetooth headscarf. Manual. Charging cable. OPP bagPacking list:1*Bluetooth headscarf. Instruction manual. Charging cable. OPP bag