1. Bluetooth version: BT V5.4
2. Frequency: 2.402-2.480Ghz
3. Working distance: 10m
4. Frequency range: 20HZ-20KHZ
5. Headphone battery: 30mAh/3.7V
6. Charging case battery: 230mAh/3.7V
7. Playing time: about 3-4h
8. Charging voltage of charging box: 5V/0.5A
9. Headphone charging time: about 1h
10. Standby time: about 180 days
11. ENC call noise reduction, comfortable communication, intelligent recording of human voice
12. Soft rubber ear hook, ergonomic design, comfortable fit
13. DT4.0 directional sound transmission black technology, no need to wear ears, efficient sound transmission
14. IPX5 waterproof, lossless sound quality