Fisher-Price Shake39N Go Nascar Tony Stewart Shake & Go Racers put the control of speed and power into kids hands! The basic play pattern consists of shaking the car, which activates a motion switch. The motion switch relays the amount of shaking to the internal IC. When the child places the car on the ground, there is switch in the front axle that when triggered, engages the motor and the car takes off with the IC playing the appropriate sound effects. The NASCAR license will make this Shake & Go Racer even more collectible.