1. Bluetooth version: V5.3 2. Playing time: 7h 3. Battery capacity: 90mAh 4. Frequency response: 20-20KHz 5. Rated power: 0.4W 6. Driver unit: 13mm 7. Input: DC5V 8. Standby time: about 50h 9. Charging time: about 2h 10. The new chip Bluetooth 5.3, the connection is more stable and the call is clearer 11. The futuristic transparent sound cavity, the sound quality is more penetrating 12. Listening to music does not hurt your ears, it is comfortable and does not hurt your ears.
