Perfect for indoor or outdoor use, PlasmaCar® requires no batteries, gears, or pedals to move---just friction and kid power! All you need is a smooth flat surface and PlasmaCar® will harness the natural forces of inertia, centrifugal force, and friction to move the car up to 6 miles per hour. Recommended for ages 3+; supports up to 220 lbs. Some assembly is required.