The Semi-Trailer Light Set when combined with the Tractor
Truck Electrical Unit Set or Multi-Function unit, allows
the modeler to further enhance appearance and performance
with functional blinkers and brake lights. The unit can be
easily installed on the semi-trailer without any complicated
wire connecting chores. Power is supplied by the truck's
running battery. The set includes semi-trailer connector
cable with light bulbs and internal circuitry board connector cable.
Includes easy to understand instructions.