This is a light switch for your refrigerator. It activates when the door of your appliance is opened, and it will turn the light inside on and off. You will need to replace this part is if your light is not working properly. In order to make this repair you will need a Phillips screwdriver, a pair of needle nose pliers, and a small flat blade screwdriver. This light switch is almost 2 inches long, 1.5 inches wide, and just over an inch thick.