This intercom is designed for use with WRC and Carbon Des, ST4 Rally and Trophy Plus Flex helmets and plugs directly into the WRC headset. It is designed to be fitted to the cars rollcage but it is portable to allow fitment as you require. It is powered by a 9 volt battery as standard, but there is a car adaptor (as shown in the image), available as an extra, to allow a permenent feed from the cars power supply (YB0100). It has individual volume controls for both driver and co-driver, and an automatic on/off power switch which operates when the co-driver has connected/disconnected his helmet plug. The green led light on the front of the unit illuminates when the intercom is on. This intercom comes with an output connection to allow you to connect your own video camera and record the conversation between driver and co-driver. Owing to the quality and the sensitivity of our electronics the use of our booster cable maybe required to allow the camera to hear the communications between driver and co-driver.