SPECIFICATION: Moddel: EA79 Bluetooth version: V5.0 Frequency range: 20Hz-20KHz Connection distance: 10m Speaker Size: Ø8 mm Impedance range: 32Ω±5% Earbud battery capacity: 25mAh Charging case battery capacity: 180mAh Charging time: —3h (volume Ot 70%) Charging interface: lightning USB