Setting: After installation, restart the car, the auto off button will be turned on automatically.The default setting is that you don't have to close the stop start engine function manually every time.If you want it for a moment, press the off button to reactivate the function.Notice: The items may be different from our pictures according to different car styles, but the function is the same.Tools for A4/A5/Q5 are upgraded, for other models, one-hole tools are good.