3681 Large Model Reddy Kilowatt Animated & Lighted Sign by Miller Signs Suitable for S scale, O scale, 4.8" w x 2.5"t, 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 Produce no heat