This thing eats up “d” batteries. Provides hours of giggles. Shoots the Hot Wheel cars at 200 scale MPH. Requires a double loop de loop to slow it down enough so it can turn around 180 degrees to enter the booster and get shot again and again. Also needed are banked curves. All available separately. Christmas 1919 Mattel reissued a set with all of that. I bought this booster to replace the one that came with that set. The right set up can run four cars at once. There is a U tube video that shows how to run it from the wall outlet with a 6 volt power supply if you have the patience. Buy this product they are hard to find and sell out fast