Features: 1. Maximum talking range 2km between two riders. real two-way, support 5 riders at the same time. 2. Remote Controller transmit 3. Works as Bluetooth handsfree for cell phone at range of up to 10 meters 4. Excellent performance at speed up to the legal limit with a full face helmet. (Up to 120Km working speed) 5. Up to 8 hours talk time 6. Up to 120 hours standby 7. Call out, call answer, call reject, call hang up 8. Safe auto-receiving cell phone calls. 9. Bluetooth V3.0 10. Control cell phone music through AVRCP: forward, backward, play, pause. 11. Automatic switching among Bluetooth cell phone, intercom, stereo music. 12. With DSP echo cancellation and noise suppression technology, crystal clear voice quality is guaranteed in a high speed. 13. To connect to the mobile phone by NFC Function. 14. 5 grade waterproof 15. mini USB Interface