Wireless Version:V5.1 Transmission Distance:10m Average battery life:4-5h Standby time:30days Battery Capacity: 200mAh,25mAh Frequency response: 50Hz-20KHz Impedance:32Ω Input:DC5V Charging time: 2h in charging compartment, 1.5h for earphone Drive unit: 13mm large moving coil sound balance surging