Originally Posted by Drake
You can more or less build those yourself. They aren't, as previously stated, real NV. They're basically just a CMOS-based camera, capable of seeing IR (like cheapo "spy cameras" on eBay) and some IR LEDs providing illumination.
+1 I built one back in high school, the 2mm IR LEDs, just like a flashlight shoots a beam of IR light, so if anyone else had one on, you would instantly see the beam and vis versa.
Basically generation 0 tech.