Hitch Critters 1063 Bad Dog Animated Ball Hitch Cover Sema award winning Plugs into your existing standard trailer/tow light plug Fits 1 7/8 inch or 2 inch ball hitches Funniest hitch covers and brake lights ever invented Comes to life when you hit the brakes Funniest hitch covers and brake lights ever invented Plug into your existing trailer light plug and they come to life when you hit the brakes Simply snap over your 1 and 7/8 inch or 2 inch ball hitch