Bluetooth version: 5.3 Driver size: 10mm Wireless Distance : 10m Frequency response: 20-20.000 Hz Earphone batteries: 25mAh each Charging case battery: 180mAh Speaker sensitivity: 102dB + 4dB Speaker impedance: 32 ± 15% Ω Microphone sensitivity: -38dB ±3dB Charging time: Approx 2 hours Standby time: Up to 90 days Working time: Up to 5 hours @70% volume Charging plug: Type-C