sotndcorelifep3 Case only Input: 5V - 0.35A Battery Capacity: 63mAh x 2 (Earphones), 800mAh (Charging Case) Charging Time: 3 hours (varies) Playback Time: Up to 7 hours (when using the charging case, up to 35 hours) Playback Time (when noise canceling mode is on): Up to 6 hours (when using the charging case, up to 30 hours) Mode / External Sound Capture Mode: Driver Size: 11 mm Frequency Response: 20 Hz - 20 kHz Impedance: 16Ω Waterproof Standard: IPX5 Communication Method: Bluetooth 5.0 Bluetooth Operating Range: 15m This is a used item, so please understand before purchasing.