In real life, not all traffic lights are the same size.
Since most cars for O scale model railroading are 1/43 scale, the Miniature Traffic Lights O-scale version is 1/43 ratio. The signal itself is 0.8" by 0.25"(1/43 of an average standard traffic signal.)
HO 1/87 scale is also available.
Can be used for model railroading or slot cars.
Built using solid-state microchip technology. Lights are LED's that will not burn out. Operates between 2-5VDC.
Also, can be powered with 3AA batteries (not included.)