The Supreme Machines Monster Trucks are a special breed of battery-operated machines. The tires are made out of a high-quality rubber, and they are permanently inflated so no air pump is ever required. With a press of the button on the top, the sirens blare, and the lights light up. With the second pressing of the button, the engine starts and revs. The monster truck is friction powered, which means it can still be operated without batteries. Push the Monster Machine forward and watch it continue forward with that stored kinetic energy.Details:Red9" x 6.13" x 7"Friction powered (can still be operated without batteries)For ages 3 and up