There were two of them, fairly heavy and maybe the size of a modern smartphone. One was formula one. I’d wind them up by pulling them backwards and driving the back wheels into the motor… that kinetic energy would go into a rumbler and a button would release the energy back into the wheels… or the rumbler would just consume the energy and the car would barely move if at all.
The other car… It was orange and looked more car-like to my child-mind. Not sure if it was nascar or a beetle.