This is a Micro Structures 441402 HO/N Who's Hobby House Animated Neon Billboard - Light Works USA Small for HO & N Scales 2-3/16 x 1-3/4 5.6 x 4.5cm. The signs are made with an electroluminescence process that allows many colors, shapes, and lighting sequences. You can mount many of them to the side of a building, on top as a billboard, as a window sign, or a roadside sign. The signs date from steam era to current times. All kits come with sign, circuit board (Inverter) and battery box which holds 3-AAA batteries. You can also use a 4.5v adapter or converter which connects to your power supply.