1. Chip: 5656A2 2. Bluetooth version: V5.4 3. Transmission distance: 10 meters 4. Charging voltage: DC 5V 5. Charging time: 1h 6. Talk time: 7h 7. Music time: 7h 8. Headphone battery capacity: 50mAh 9. Charging case battery capacity: 400mAh 10. Frequency range: 20Hz-20KHz 11. DT4.0 directional sound transmission, lossless sound transmission without sound leakage 12. Smart touch technology, easy control with one finger 13. Lightweight and comfortable to wear 14. Adaptive rebound technology, fits the ear firmly and does not fall off