Laser Jammers: Laser Star Allegedly Turns Your Clunker Into Invisible Asphalt Phantom
check out the first comment:
"I've had an Escort ZR4 laser jammer/shifter installed on my car for about 6 years now"
more great reading from the comments:
"From what I can tell on the sponsorship though they give you the cheapest one they make which only covers one direction. They make one with 4 transponders so you can put one in front, one in back and one on each side."