Bluetooth version: V5.0+EDR10 meters Broadcast time:4-5 hours battery capacity: 200mAh Charging time: 2 hours Loudspeaker diameter: Ø 40 mm Sensitivity: 110±3dB Impedance: 32 Ω Frequency response: 20HZ-20khz Sensitivity: 110±3dB Impedance: 32 Ω