This sign lights up and can be used on the interior or exterior of any miniature building. Size of this sign is 2" wide, 1 1/8" high. It comes with a large assortment (see photo) of letters and numbers to personalize the sign. I made this sign to be used in my miniature version of my own store. The back of the sign has the "on/off" button and the spot that holds the replaceable CR927 battery. I would suggest that you use Velcro to attach this to the wall of your structure so that it is easily removeable. This sign could also sit on a piece of furniture with a "feel good" saying on it. There are lots of uses.