This is a light bu, and it is made for microwaves. This is a genuine replacement part made by General Electric. This specific light bu has a voltage of 120 and a wattage of 25.A new light bu might be needed if the current one does not turn on when the microwave door is opened. The light bu should also be on when the microwave is in use so that the user may see the food during the heating cycle. It is common for light bu to burn out over time and they are very easy to replace when needed.This is an OEM part sourced directly from the manufacturer. It is sold individually and is compatible with microwaves made by General Electric.WB36X951 (AP2029991) replaces 260392, AH247776, EA247776, PS247776, WB36X0951.