The Snooper SLD920 is an industry first, designed specifically to counter the latest threat, the Laser Speed Gun. Combining a unique Laser detector and diffuser to give maximum protection. The SLD920's unique design consists of two patented transponder modules installed behind the grille of the vehicle and then wired directly to an audible warning system inside the car for total discretion. This unit is not only a laser detector it sends out a constant infrared screen around your vehicle that will diffuse any Laser beam directed at you. Please read our FAQ section before purchasing this device.