VERTIX Raptor-i Wireless Motorbike Helmet Communicator and Wired Mic Headset for Full Face Helmet Clear communication even at 210km/hr - https://www.youtube.com/watch?v=Y6QWc2nTyis 500m intercom between 2 riders within line of sight, full duplex intercom can pair up to 3 riders. 1 year international warranty for Raptor-i. Can be paired to mobile phone, GPS and MP3. Easy installation with EZ Mount System, sturdy 3M Dual Lock prevents lightweight Raptor-I (48g) from dislodging. All weather use, 8 -10 hour usage on full charge and 30 days standby. Multi point connection: up to 4 devices. 90 days warranty for wired microphone. It comes in the form of a small capsule and is integrated with the speaker for easy mounting on full-face helmet designs.