These are probably the smallest RC cars in the world. The car itself is 2.75" long. The built in battery can power the car for 2 minutes at maximum speed. Recharging is accomplished by aligning contacts on the side of the transmitter with those on the bottom of the car. Hold it there for 45 seconds and you are ready to race! Set includes medium soft tires, Micro B 1.0 motor, transmitter. Frequency: 35 MHz. 2 AA batteries required.