BlueAnt InterPhone Bluetooth Helmet Kit (Black) Wireless, water-resistant, windproof Bluetooth headset for motorcycle riders Bike-to-bike Intercom for rider and passenger or two separate bikes up to 490 feet (150 metres) Easily mounts to all full faced and open faced helmets DSP noise cancellation/echo cancellation adjusts sound levels to compensate for loud engine noise, wind Includes: Interphone speaker and microphone modules, travel chargers, 2 clip mounts (adhesive and clamp), spacer, Velcro pads, user manual