Audio Monitor: CapacitiveOutput: 10mW 28Hz-20kHzReverberant Mode: Echo sound effect reverberationPowered: Built-in Li-ion batterySound Pressure: ≥126dB 1kHz THD ≤1%Charge: DC 5VSize(L*W*H): about 11cm * 3.5cm * 2.5cm8 hours charging time for the first use. And then 4 -5 hours for the following times. Can use 5 hours continuously after full charged.Fit for DC 5V Adapter， also can charge in PC