Vnetphone&reg; Waterproof Motorcyle Wireless Bluetooth Helmet Intercom Headset 1000M,up to 6 Riders DK118-V6-D (Pack of 2) This high end multi interphone system can pair "rider to rider" or "rider to pillion" and allows up to 6 riders to connect together, one host,five affiliated ones.One as the host can switch to talk with anyone of five affiliated intercoms freely; Maximum range 1000 meters bluetooth intercom, Motorcycle riders, skiing enthusiasts, construction and mining workers, fire control personnel, traffic police, etc.. Up to 120km/h speed;Up to 7hours talking time;Audio navigation from GPS;Line-in audio interface Wind noise DSP cancellation;Full weather protected;Fits any motorcycle helmet;Plastic + Rubber button, more stable structure, better waterproof performance Works with any Bluetooth equipped mobile phone,GPS or MP3 Stereo music;With 3.5mm audio input, can work external media play devices, like MP3/portable CD player/IPOD and etc.