BD B7 TWS Wireless Earbuds (TWS) Enhanced Active Noise Cancellation Wireless: Version 6.0 Operating Range: 10 meters Earbud Battery Capacity: 3.7V, 30mAh Music Play Time: 6 hours (at 80% volume) Standby Time: 40 hours Charging Case Capacity: 3.7V, 300mAh Charging Case Charging Time: 1.5 hours