Bluetooth version: 5.3 Driver size: 13mm Effective range: 10m Frequency response: 20Hz-20KHz Earbuds battery: 25mAh each Charging case battery: 180mAh Speaker sensitivity: 112 ± 3dB Speaker impedance: 32 ± 15% Microphone sensitivity: -90dB Charging time: Approx 2 hours Standby time: Up to 90 day Working time: Up to 4 hours @70% volume Charging plug: Type-C