It's an older model Fluke Flex Cam Infrared camera that I use for my work as a commercial roofing contractor. I bought it used.
DON'T buy one, a stethoscope, or using the palm of your hand (like JP) to detect heat will show you their location just as well.
And, the cotton pickin thing lies all the time I've found, invarably colonies are 2 to 3 times larger than the camera shows, because the bees don't cluster tight enough to give off heat except right around the brood.
Don