Impedance: 32 Pass band (min): 20 Pass band (max): 20000 Sensitivity: 92 Range: 10 Other features: Specification:Bluetooth version: 5.1Talk time: 4-5 hoursMusic listening time: up to 4-5 hoursCharging time: 1.5 hoursStandby time: up to 210 hoursDocking stationcapacity: 350mAh Handset battery capacity: 45mAhRange: up to 10m