Version of Bluetooth: 5.3 Size of driver: 10 mm Ten meters is the wireless distance. Response frequency: 20–20,000 Hz Each earphone battery is 30 mAh. Battery for charging case: 400 mAh Sensitivity of the speaker: 108 ± 3dB Impedance of speaker: 32±15% Ω Sensitivity of the microphone: -38dB ± 3dB Time spent charging: about two hours Maximum standby duration: 180 hours Up to 5.5 hours of work at 70% volume Type-C charging plug