Working lights will add drama and action to your entire layout, and this economical kit makes it easy to install lighting in almost any building. It's completely assembled, with screw-type bulb, socket with hook-up wires and a plastic mounting base, which can be nailed to your layout surface, or glued inside your buildings. This all-purpose house light is pre-wired for easy operation. Includes one complete lighting unit. Use #433-1203, sold separately, for replacement bulb.