... more systems to get to 6). *Long range-1000 meters intercom, Bluetooth interphone kits for helmet motorcycle, Snowmobile, ski, ATV etc ... .*communication system 6 Riders. *1000m maximum intercom range *Up to 120km/h speed *Up to 7hours talking ... , can work with external media play devices, like MP3/portable CD player/IPOD and etc. Plastic + Rubber button, more stable structure ...