Midland BT2S Bluetooth Intercom System for Motorcycle (Single) Wireless Intercom System Rider & Passenger Or Motorcycle To Motorcycle Compatible With Most Helmet Types Compatible With Other Bluetooth-Enabled Devices Such As Cellular Phones, Gps, Mp3 Players & 2-Way Radios System Can Pair Up To 220 Yards Away Complete Bluetooth wireless multimedia system for a solo motorcycle rider Connect up to three separate Bluetooth devices or use 3.5mm wired audio input Automatic gain function that controls the volume in relation to background noise Two wind-resistant, noise-canceling microphones included to fit open-face/flip-top helmets Pair with a second BT2 unit for bike-to-bike communications up to 220 yards