Fully licensed by General Motors wall clocks. Diameter is 15 inches, and clock runs off 1 x AA battery (not included). Neon is powered by AC adapter (included) with on/off switch, and easily plugs into regular outlets. *For indoor use only. Shelby. Ford Motor Co. Camaro. Jeep. Ford Genuine Parts. Chevy Trucks. See other ads for classic car hats, t-shirts, banners and signs.