Add color and action to your city scenes with these unique kits. Perfect for detailing business buildings, the various sizes can be used to model smaller exterior or window-mounted signs in S, O, or G Scales. (PLEASE NOTE: these kits are NOT for outdoor use.) Each is made of special plastic that is just .008" thick for a near-scale appearance. The sign is coated on one side with phosphor, which glows when current is applied. This produces a soft, neon-like light that is bright enough to be seen under regular room lights, but generates almost no heat. Each kit comes with an assembled 3 volt power supply which requires two AAA batteries, not included. Complete instructions cover all of the steps needed for installation and operation. Horizontal signs are designed to mount on a roof or wall.