Specifications 1000m motorcycle helmet walkie talkie for 6 people 1. Up to 120km/h working speed, 8 hours talking time 2.High quality 2013 1000m motorcycle helmet walkie talkie for 6 people Main features: long range-1200 meters intercom, bluetooth interphone kits for helmet motorcycle, snowmobile, ski, atv etc. communication system 6 riders. 1200m maximum intercom range up to 120km/h speed up to 7hours talking time auto-receiving mobile call mobile/mp3/stereo music audio navigation from gps line-in audio interface wind noise dsp cancellation full weather protected it can pair "rider to rider" or "rider to pillion". Can pair 6 interphones at a time, and easily switch to any 2 of them. works with any bluetooth equipped mobile phone, gps or mp3 stereo music with 3.5mm audio input, can work with external media play devices, like mp3/portable cd player/ipod and etc. plastic + rubber button, more stable structure, better waterproof performance. This system is fully weather protected. wireless hands free communication for motorcyclist safe driving while talking with friends play stereo music from your mobile phone can be used as a bluetooth headset and a wireless music headset while you're not riding Other features: Digital signal processor(dsp) technology for wind noise cancellation excellent performance at speeds up to the legal limit with a full face helmet easily molunts to all full face and open face helmets General feature: Up to 7 hours talk time when connected to your cell phone up to 7 hours time when listening to music 500 mah li polymer battery standby time: 120hrs charging time: ~3hrs chip brand: csr 20.515.55.5cm 0.54kg/pc