This part is the exterior replacement light bulb, with a small screw base, for your microwave. If your light bulb is burnt out, it will not be able to do this, and will need to be replaced. Before you change the bulb, be sure to check that the light socket still works, as it may need to be replaced as well. This bulb is 40 watts, is sold individually and is a genuine OEM part. Remember to disconnect the microwave from the power source before you begin this repair.