Bluetooth: BT8922F2, V 5.3 Battery: 40mAh earbuds, 500mah charging case Frequency of operation: 20 Hz–20 KHz Two hours for charging; four to five hours for working 200 hours is the standby time. Quick charging is supported by the Type C charging port. The charging case measures 65 x 27 x 50.3 mm. Earbuds: 34 x 22 x 24 mm