This device is useful for quickly determining if a receptacle has power and if there is anything obviously wrong with the wiring. Enhanced models perform GFCI testing but this tester is essentially idiot-proof through the use of three lights and a sticker explaining the meaning of these lights.
Security or emergency lighting fixtures that are typically mounted above drives and entryways, often fitted with a proximity sensor along with a daylight sensor.
The raccoon set off the booger light again, but he doesn't seem to mind. The bugeye in the hallway doesn't work.