WolVol Bump & Go Electric Flash Light Train Toy with Music LED Flashing Lights and Sound Effects Bump and Go Action, runs on smooth surfaces It will change directions and run when it bumps into something Size: Approx 13 inches(length) x 3.5 inches(width) x 2.5 inches(height) 3 AA batteries required (not included). To close the battery cover, push down and slide it in.