This thing AIN’T no retina scanning device. In fact, it does something completely the opposite. It’s a laser. The device, the Photonic Fence, comes from the folks at Intellectual Ventures Laboratory. It tracks and kills mosquitos using a laser (enter Dr. Evil voice). But it doesn’t just kill any mosquito, it only kills the females, the blood suckers.
So why not just use some sort of chemical to eradicate the little beasts? Chemicals are dangerous, cause cancer and kill off other wildlife.