A Radar Jammer detects an RF signal from an X-band, K-band or Ka band radar gun, which is used in a radar speed trap. The radar jammer immediately begins to lock onto the incoming radar frequency, and then transmits back an overpowering noise signal to the radar gun. When the radar gun receives this noise signal, the radar gun’s microprocessor begins to track the wildly fluctuating, false Doppler signals from the radar jammer. As long as the radar gun microprocessor is kept busy tracking a false and ever-changing Doppler signal, it can not display a speed reading. Therefore the gun display remains blank. During this period of time, the radar jammer has alerted you to either X, K or Ka radar, allowing you to safely adjust your speed to the posted speed limit, at which time you shut the radar jammer off, allowing your adjusted speed to be detected by the radar gun. Since your speed is now at the posted speed limit, the radar gun operator pays no more attention to you, and starts searching for the next victim. The last radar jammer used in the USA and Canada was the Scorpion radar jammer, which was preceded by the Phantom VRCD, all of which are now banned in the USA.