Bluetooth version: 5.3 Driver size: 10mm Wireless distance: 10m Frequency response: 20-20000Hz Earphone battery: 30mAh each Charging case battery: 400mAh Speaker sensitivity: 108 ± 3dB Speaker impedance: 32±15% Ω Microphone sensitivity: -38dB ± 3dB Charging time: Approx 2 hours Standby time: Up to 180 hours Working time: Up to 5.5 hours @70% volume Charging plug: Type-C