Receives signal from police laser gun and transmits jamming signal. Police cannot get return lock. It is legal except Virginia. Requires two sensor/transmitters mounted in front, likely in grill. Wondering if an S4 installation requires cutting or something drastic. Look at Escort ZR4 or Blinder.
Seems that at $500-$1000 for one of these things you would really be better off paying for a traffic attorney if you got a speeding ticket.
Or, better yet, use some brains about when and where to speed. I have little sympathy for all the whack jobs in my neighborhood who think it's okay to drive 40 mph through a 15mph elementary school zone.
Never heard of a "laser shifter" what is it supposed to do for you?
I'm in Canada. I haven't taken delivery of my S4 yet but I installed a ZR4 in my A4 about 5 years ago. I buried the two front units in the fog light grills but I needed to cut the plastic ribs. The plastic A4 fog light grills didn't cost much to replace if you screw it up. I also mounted the unit meant to go on the back trunk in the center grill but it sticks out a bit.
Does it work? The thing rings when its supposed to but I haven't had an occasion to find out that it doesn't scramble the signal. I do know that I haven't been pulled over the 10 - 15 times that I was doing 12 - 15 MPH over the speed limit. I'm a lead foot on the highway but haven't been nailed by laser going at speed that would catch a ticket for sure.
I've used both the Blinder Extreme M20 + Laser Interceptor. Both had two forward facing receivers/emitters. Both were installed on previous cars (STi's) - I haven't yet ordered a jammer for the S4, but plan on doing so soon.
I've had very positive results with the Blinder. On more than one occasion it has alerted me to (and presumably jammed) laser. When it activates, I typically check my speed, quickly adjust if necessary, then switch off the jammer. I've noticed many confused faces when I then pass the guy shooting me.
I had the Interceptor on my most recent STi, but sold it before it proved its value. So I can't comment on the effectiveness of that unit. I bought it due to the high marks from http://guysoflidar.com/ - so I presume it's quite effective.
If I do install a jammer on the S4, I'll make sure to post a DIY with lots of pictures. =)
2010 Audi S4 - Ibis White, Black Alcantara, S-Tronic, B&O, Rear Sport Diff
07 Impreza WRX STi, SPT Intake + Exhaust
04 Impreza WRX STi