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1. drive: 15mm
2. impedance: 32 OHM
3. Bluetooth version: Bluetooth 5.0
4. Bluetooth distance: barrier free 15 meters
5. frequency response: 20-20000Hz
6. sensitivity: 32dB
7. have A2DP /AVRCP high quality stereo audio transmission and remote control protocol.
8. powerful noise cancellation circuit (active noise reduction)
9. switch between Chinese and English (turn off the Bluetooth state, switch 2 times, hear the prompt switch successfully)
10. Charging time is about 1 hour (power indicator charging: red light on, full charge: red light off (blue light).)
11. speaking time is about 2-3 hours.
12. music time is about 2-3 hours.
13. standby time is about 96 hours.
14. charging time is about 60 minutes.
15. charging power: DC5V power [circular hole interface] (computer USB port, mobile phone charger, vehicle charger)
black, white, gold, rose gold, and red.
With not Charge Box ：earphone + charging line + Manual (Chinese and English double-sided)
With Charge Box ： earphone + charging line + Manual (Chinese and English double-sided) + Charge Box