Have you ever had the feeling that when you touch the body of a car you get a small electric shock? This is called static voltage. It can build up as a result of friction not only on the car, but also on your clothes and even your body. As a result, you get a discharge when you touch an object. The key fob helps to relieve the voltage and the built-in light bulb takes over the discharge. To release the voltage, simply touch the tip of the key fob to the surface you are about to touch. The light on the key fob will illuminate, this will indicate that the procedure is complete. There are several colors to choose from.