The Snap Power Guidelight is a wall plate that fits over a standard electrical outlet and provides a fully functional night light.
When you look at Guidelight, it looks like a standard outlet cover plate from the front, with the exception of this light sensor at the bottom. You have the option for both standard duplex style, and decorative outlets like I have in my house.
When you turn it around, you can see the two tabs that fit over the screws that are found on the side of all wall outlets. Pretty cool.