This is Mr. Ghost, an electromagnetic field (EMF) detector that can show you how much radiation your electronics are spewing out. It plugs into the headphone jack of your iPhone and comes with an app that shows you how much radiation is being emitted, and the direction its coming from. Ghosts, as I'm sure you learned on some crappy supernatural reality show, allegedly emit electromagnetic fields, so it can also be used for ghost hunting. "What about lion hunting?" Oh most definitely! (I never liked you anyways)
Hit the jump for a picture of the electromagnetic field a flatscreen TV creates and a video about Mr. Ghost.
Thanks to Aaron, the man behind Mr. Ghost, who informed me it also triples as a dork detector if you hold it up to one of your friends and make beep beep beep noises.