Stilo WRC DES 9V features the extra noise filter as the EVO model giving the best noise cancelling on the market. The intercom features individual volume controls for the driver and co-driver and on the back of the intercom box there's a camera/radio connection. The intercom box has been designed for fitment on the rollbar. The AB0214 intercom gives you 2 options for powering the system, either via a 9v battery or hard wired to the car with a battery eliminator.