What looks like an innocent normal analog watch actually has a small built-in spy camera and microphone that is very hard to detect.
The camera is positioned so that the captured image is correctly oriented when the watch is upside down, since that is the common position of the watch in most natural scenarios.
The receiver unit features a 2.5 inch LCD and can monitor 4 wireless cameras at one time. You can also use it to play music and video.
Aside from spying and malicious intent, it can actually be used to punk people.