Great addition to Miller's rooftop signs! Designed for HO & O-Scale! These signs are simple to install and a pleasure to look at. Sign measures approx. 2" wide x 2.2" tall and come on a clear background that can be trimmed as small as .825" wide by .9" tall. They run on 4.5 volts DC just like all the other billboards and are compatible with Miller's AC adapters and ME48040 converter modules.