Bluetooth Technical Parameters:Bluetooth version: 5.0Bluetooth transmission distance: 10mMusic Playing Time: Maximum sound 7h, average volume 10hMicrophone distance: 1mBluetooth standby time: 72hBattery capacity: 150mA/hBattery power: 0.55wHorn impedance: 32 ohmHorn power: 0.02wFrequency range: 2.4-2.4835ghzSensitivity: 45dBAudio output distortion: 0.6%Audio output SNR: 93dBCharging time: 1-2 hoursMaximum input voltage: DC 5VMax input current: 150mahMaximum input power: 0.55w