Wireless Version: V5.0+EDR Transmission distance: 10m Playing time: 4 hours Stanby time: 300 hours Battery: 200 mAh rechargeable lithium battery Charging time: 1.5 hours Driver unit: 40mm Impedance: 32Ω Sensitivity: 110±3dB S.P.L at 1KHz Frequency Range: 20Hz-20KHz Max Input Power: 15mW