The version III replaces version II but is functionally the same. The new black PCB has a smarter look to it and is now the standard.
Now you can adjust the sensitivity and feel of the controller, even while you drive. The Brakes are applied normally when the trigger is released, but the Brake button applies the brake regardless of the trigger position.
Digital slot-car controller with Brake and Lane Change Buttons, Sensitivity knob and replaceable Wiper Contact Board.