The all-new RC Tractor Truck Multi-Function Control Unit provides incredible sound and action options for Tamiya's new Knight Hauler or any other 1/14-scale RC Tractor Truck. It offers 24 sounds that have been digitally recorded from a powerful full-scale truck. Not only does the Control Unit control sounds like air brakes, engine idling, coupler connection and more, it also works lights, turns power on and off, functions as a low-speed electronic speed control, vibrates and many more fantastic functions.