Be prepared when the power goes out. This plug-in light has an automatic guide light for use as a marker light at night, but also a has a flashlight light bulb that will automatically turn on if and when the power goes out. On a full charge it will remain illuminated for 75 minutes. This light can also be used as a handy flashlight simply by removing it from the wall socket. It will plug into any 120V polarized (three-prong) socket.