88-0851 Lifesaver 3D Billboard by Miller Signs Suitable for HO scale, S scale & O scale, 3.8"t x 4.5"w, 3D sign, Limited edition, comes with billboard supports The sign comes with a circuit board and AAA battery box, simple to install on your structure on the curcuit board there is a on/off switch and a push button to change the sequence, has over 40 sequences may also be lighted with a 4804 converter or 4803 or 4803 adapter