Tamiya MFC-01 1/14 Semi Truck Multi-Function UnitThe Tamiya 1 14 Semi Truck Multi Function Unit provides incredible sound and action options for Tamiya's 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,