V10(10-man intercom) Riding motorcycle helmet headphones Multiple calls

Specification
 1. Operating range: up to 10M; 
2. Bluetooth: 5.0, CSR BC05, support HSP HFP, AVRCP, AGHSP, Private Intercom 3. Transmission range (Hz): 2.4 GHz
4. Sensitivity: -83dBm 5. Built-in 3.7V, 650mA lithium battery, notify the power and low battery.
6. Standby time: 350 hours
7. Talk time: 12 hours
8. Charging time: 2 hours
9. Profile support: A2DP+EDR
10. Support for Siri: Yes
11. Finish: Rubber oil painting
12. Working temperature: -20~45°C
13. Main material: ABS
14. Size: 85*42*23mm
15. Weight: 47.50g
16. Certification: CE, ROHS, TELEC, FCC
Functions: 1. Support 2~10 people full-duplex intercom, 10 people intercom at the same time, 2 people per person up to 250m, maximum intercom distance 2500 meters.
2. Bluetooth connection to phone, phone music function and other operations.
3. Switch between phone, music, FM, GPS playback and intercom function.
4. DSP noise reduction function, echo cancellation and noise suppression.
5. Waterproof grade: IP67. 
6. Built-in 3.7V, 650mA lithium battery, which can inform the power; Low battery notification.
7. Built-in FM radio function.
8. Support pairing with other brands of bluetooth intercom and ordinary mobile phone bluetooth headsets.
9. Support to connect to ordinary radio PTT control intercom; and hybrid features. 
10. The button enters the factory self-test mode, which can detect the button. 
11. Support software upgrade, easy to customize 

the packing list: 1 bluetooth host
1 x Stereo headphones
1 USB charging cable: 2 helmet clips (screw clip + velcro clip)
2 microphones (hard and soft)
1 x User Manual