LEXIN Max2 800m Bt Bluetooth Motorcycle Helmet Wireless Bike to Bike Intercom Interphone Headset With the LX-MAX2, you can call hands-free on your Bluetooth mobile phone, listen to stereo music or voice instructions of GPS navigations by Bluetooth wirelessly, and have intercom conversations in full duplex with a passenger or rider to rider in a range of 800M (2600 feet) distance. Full duplex wirless bluetooth handsfree intercom communication ,support voice speed dial by activate siri for iphone or s voice for samsung 800m (1640 feet) intercom range,A2DP bluetooth for wireless music & audio gps direction,high-end supreme sound with advanced noise cancellation technology Auto receiving cellphone calls & intercom calls ,wireless bike-to-bike intercom ,wireless rider-to-passenger intercom Waterproof design, handles all weather conditions,plug earphone & microphone in helmet - fits into the ear well of all standard helmets.up to 120km/h speed ,up to 8 hours talk time, 120 hours standby time