Version 5.3 of Bluetooth Wireless distance: 10m; driver size: 10mm Response to frequency: 20–20.000 Hz Each earphone battery is 25 mAh. Battery for charging case: 180mAh Sensitivity of the speaker: 102dB + 4dB Impedance of the speaker: 32 ± 15% Ω Sensitivity of the microphone: -38dB ±3dB Time needed to charge: about two hours Time on standby: up to 90 days Up to five hours of work at 70% volume Plug for charging: Type-C