Pay attention to the pairing method:
when the two headsets turn on at the same time and the red and blue lights flash:
1. After pressing the main button two or three times in quick succession, one of the headsets can hear a pair of headphones successfully flashing red and blue lights after two seconds.
2. Long press one of the headset main keys for about three seconds and hear a beep and let go, you can hear a successful red and blue light flashing on the headset
Specifications:
1. Driver: 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 25MM. Width 15MM. High 35mm
16. Talk time is about 4-5 hours
17. music time about 4-5 hours
18. Standby time is about 120 hours
19. The charging time is about 60 minutes
20. Battery capacity 60MAH 
Package include:
2 x HBQ i7 TWS wireless independent Bluetooth headset (1 Pair) 
1 x USB Charging Cable
1 x User Manual