XG8 noise reduction sports headphones1. The battery capacity of the battery compartment: 300mA 2. Battery protection board IC brand: transistor battery protection board 3. The battery capacity of the headset: 35mA 4. There is a battery in one ear or a battery in both ears: both ears with battery 5. How long can each use: 3 hours 6. How many times can the battery compartment charge once: 4 times 7. Bluetooth version: v5. 0 + EDR 8. Double ear canal transmission or single ear canal