Neon4Less Neon Signs feature multi-colored, hand blown neon tubing. The glass tubes are supported by a black finished metal grid, which can be hung against a wall or window; they can even sit on a shelf. Neon4Less neon signs have a warm mesmerizing glow, and are powered by industrial strength transformers, which operate silently and more efficiently than incandescent bulbs. All you do is hang it up and plug it in no assembly or special wiring required. Measures 23 inches x 23 inches x 4 inch(es).FOR INDOOR USE ONLY.