The Drivin' Gear set is an innovated device that came out in 1972 that gave Hot Wheel cars the ability to drive and turn remotely. In order for the device to work you would need your Hot Wheels car, attach the "wheel mount" holders to it, and then attach the "Drive Unit" for your Hot Wheels Car to be Ready!
The set comes with a Gear Shifter and a Steering Wheel. Shifting the Gear Shifter will send more power through the lines and into the motor to increase the speed of the car. The Steering Wheel controls the little wheel on the Drive Unit to control the car.
It is believed that the Drivin' Gear will work with all or most Hot Wheel cars. But the Drivin' Gear was advertise on the 1972 Hot Wheels blisters such as: