Product parameters:<br />Note: This is a headset・ not a pair of headphones.<br /> <br /> 1. Drive: 15mm<br /> 2. Impedance: 32 OHM<br /> 3. Bluetooth version: Bluetooth v4.1 + EDR<br /> 4. Bluetooth use band: 2.4GHz<br /> 5. Power level: CLASS II<br /> 6. Output power: 30mW<br /> 7. Bluetooth distance: 10 meters barrier<br /> 8. Frequency response: 20-20000Hz<br /> 9. Operating voltage range: 3.0V-4.2V<br /> 10. Mitou sensitivity: -42dB<br /> 11. With A2DP / AVRCP high quality stereo audio transmission and remote control protocol<br /> 12. Powerful noise de-noising circuit (active noise reduction)<br /> 13. switch between Chinese and English (boot does not connect Bluetooth state・ press the switch 2 times・ hear the tone switch successfully)<br /> 14. Charging time about 1 hour (power indicator charging: red light・ full power: red light off (blue light)<br /> 15. Product Size: Length 25MM. Width 15MM. High 35mm<br /> 16. Product net weight of about 5g<br /> 17. Talk time is about 4-5 hours<br /> 18 music time about 4-5 hours<br /> 19. Standby time is about 120 hours<br /> 20. The charging time is about 60 minutes<br /> 21. Battery capacity 60MAH<br /> 22. Charging power: DC5V power supply [round hole interface] (computer USB port・ mobile phone charger・ car charger<br /> 23. Compatible phone: compatible with Andrews・ Microsoft・ Saipan system with 99% of the Bluetooth mobile phone<br /> <br /> Features:<br /> <br /> 1. listening to the song correct・