In this Maserati, we installed a K40 Radar System with defusers. The K40 Radar System helps to prevent speeding tickets, and even comes with a speeding ticket guarantee! What is the K40 Radar System and Laser Defuser? The K40 Radar System is a radar detector that alerts you when your speed is being tracked. The laser defuser actually alerts the driver of the vehicle that its speed is being tracked, and prevents the police from detecting the vehicles speed all at the same time