2. Impedance: 32 OHM 

3. Bluetooth version: Bluetooth V4.1 + EDR 

6. Output power: 30mW 

7. Bluetooth distance: 10 meters without obstacles

8. Frequency response: 20-20000hz 

9. Operating voltage range: 3.0v-4.2v 

10. Microphone sensitivity: -42db 

11. Have A2DP /AVRCP high quality stereo audio transmission and remote control protocol 

12. Powerful noise de-noising circuit (active de-noising) 

13. Switch between Chinese and English (switch on is not connected to bluetooth, press the switch twice, and the prompt sound is successful)

14. Charging time is about 1 hour (power indicator charging: red light on, fully charged: red light off (blue light on).)

15. Product size: 25MM in diameter. 15 mm wide. 35 mm high

16. The net weight of the product is about 5g

17. Talk time is about 4-5 hours

19. Standby time is about 120 hours

22. Charging power supply: DC5V power supply [round hole interface] (computer USB port, mobile phone charger, car charger)

23. Compatible mobile phone: compatible with android, ping guo, wei software, symbian system 99% with bluetooth feature phone

Full set weight: 60g
Package size: 9.5*3.5*13 cm
Color: black, white, gold, rose gold, red

Standard: earphone + charging cable + instruction manual + packing box