Radar guns work by sending radio waves of a specific frequency. The radio waves then bounce off of the vehicle or object then return to the receiver called the receiving station. To measure how fast the vehicle is moving the radar gun uses a calculation created by the scientific theory called the 'doppler effect'. When the radio wave returns the frequency shifts, this shift can be calculated and used to determine how fast an object is moving. So in fact radar guns measure the speed your vehicles going by measuring the original frequency to the new reflected frequency. Radio waves can be in the form of heat, light, or noise. So the next time you get a ticket you can thank Christian Doppler for being genius enough to invent the 'doppler effect' and create a mathmatical formula that can be used to compute the effect.

To help understand how radio waves can be calculated I'll give you this example; If a fire truck is coming down the street with his siren blasting then the radio wave frequency of the siren will increase the closer it gets and when it passes you the frequency will begin to decrease the further it gets. When the fire truck passes you the frequency of the siren will be the same as the frequency received by you.

If your interested in purchasing a radar gun then please purchase it from an American company. This kind of technology can be used for military purposes and we wouldn't want to help fund some foreign countries research into it. A good website run by an American company for Sports and Traffic Radar Guns is www.radargunsales.com. Also, you'll notice every product you view on their website states it comes with a warranty.