Well, Max...since you asked, lol....Pizzaguy is correct, as a technician. All that he states is right on. Now to the real world. Like many things, a tool is only as good as its operator. To say a policeman doesn't always see you, so go ahead and speed, is like putting one bullet in your revolver and spinning the cylinder pulling the trigger. Sooner or lately, it will go bang. Those of us who have yrs of experience using RADAR, LIDAR, and the one he didn't mention, which is my favorite, btw, is VASCAR. You see not all Barney Fife's are a like...we choose different weapons for the job at hand. Just when you and your radar detector think you are untouchable, some ole' man like me just sets there patiently waiting for a visual of my intented target, at which time, Pizzaguy, I turn on my "tool" and begin, my "tracking history" of the target vehicle. This is important that I use sound, as mentioned, for the track. Most, and I mean Most officers find the sound annoying and don't use it. Big mistake in court, because, now you can't testify you actually "tracked" that vehicle. Back on point, I now have my tracking history as the car passed by my antenna. Off I go to have a talk with my suspect. He has a detector, but it didn't go off, well it went off, but my finder was faster than his foot, lol, because I never give my position away by turning it on and off to just check speed, but wait until I really have a violator. Sneaky, but effective. Now Pizzaguy, tell them about my VASCAR...