FLIR One is an iPhone 5/5s case that features two side-by-side cameras on its backside: An infrared one and a VGA one that adds a bit more detail to the blobby heat-mapped image. The case has its own built-in battery, a 1400mAh unit that powers things for a couple of hours. That battery won’t charge your iPhone, but it does prevent the case from having to sip off the iPhone’s charge.

You use the case with a free app to scan things for their thermal properties and capture those images if you want to—the app comes with some filters, panorama and timelapse modes, and video-recording capabilities if you’re primarily interested in its imaging skills.