What is PiCOEYE?

Okay, riddle solved. For years now I've noticed something in many public restrooms called Picoeye. (Pronounced a bit like peek-o-eye.) It's a device attached to the ceiling that looks like this:

I understand the "eye" part alright, but the "pico" I thought could be either "peek" or "picture". I thought that there were actually people putting security cameras in public restrooms. However, finally I looked it up on the Internet, and as it turns out, it is a fire alarm, sensitive enough to pick up the strike of a single match.

So if you are in the rest room in Japan and see one of these rest assured that pictures of you doing whatever you are doing aren't being capture by at least *this* specific device. One less thing to worry about ...