ASTOUND I9-TWS Lightweight Earphones,Portable Charging Box Bluetooth  (White, True Wireless)

1. listening to the song correct, support songs and then call, 2.For iPhone power display, you can always watch the headset power situation, do not worry about the headset no electricity to make your life worry; 3. One to two connections, can be connected to two mobile phones; 4. Bluetooth headset every time connected to the phone after the shutdown, and then open the Bluetooth headset will automatically connect back to the phone, but also more convenient; 5. Intelligent compatibility: support all with Bluetooth mobile phone, tablet, notebook, singing it, QQ music, movies, etc., all the mobile phone; 1. Drive: 15mm 2. Impedance: 32 OHM 3. Bluetooth version: Bluetooth v4.1 + EDR 4. Bluetooth use band: 2.4GHz 5. Power level: CLASS II 6. Output power: 30mW 7. Bluetooth distance: 10 meters barrier 8. Frequency response: 20-20000Hz 9. Operating voltage range: 3.0V-4.2V 10. Mitou sensitivity: -42dB 11. With A2DP / AVRCP high quality stereo audio transmission and remote control protocol 12. Powerful noise de-noising circuit (active noise reduction) 13. switch between Chinese and English (boot does not connect Bluetooth state, press the switch 2 times, hear the tone switch successfully) 14. Charging time about 1 hour (power indicator charging: red light, full power: red light off (blue light).) 15. Product Size: Length 2cm. Width 1.7cm. High 4.5cm 16. Product net weight of about 5g 17. Talk time is about 4-5 hours(with charger box) 18: Talk time is about 1.2 hours (USE ALONE): 19. music time about 2-3 hours(with charger box) 20. music time about 1 hours(USE ALONE) 21. Standby time is about 100 hours 22. The charging time is about 60 minutes 23. Battery capacity 60MAH 24. Charging power: DC5V power supply [round hole interface] (computer USB port, mobile phone charger, car charger)