This unit is designed for Tamiya's 1/14 Scale R/C Tractor Truck Series models. The Tractor Truck Electrical Unit Set allows the modeler to further enhance appearance and performance with functional headlights, blinkers, hazard-lights, and reverse beeper. Unit installation can be easily accomplished on the completed tractor truck model with only minor modifications. Power is supplied by the truck's running battery. Set includes all necessary components such as light bulbs, LEDs, cables, switches, and circuitry board. A light set is also available separately for the optional semi-trailer (not in kit).