At this week's CES in Las Vegas, FLIR debuted a $350 case that turns the Apple iPhone 5 or 5s into a thermal imaging camera. The FLIR ONE enables users to detect heat signatures from either people or animals up to 100 meters away, and what's seen on the screen can be captured as photos or video. The case itself has a built-in battery, which can power the camera for up to four hours or provide up to 50 percent more power for your iPhone if used as a backup battery. The app for the FLIR ONE, meanwhile, can be used to interpret the resulting thermal data, highlighting the varying degrees of temperature. A useful tool for hunters and home inspectors (not to mention amateur ghost hunters), the FLIR ONE will go on sale this spring.