Buy from reputable person...BLINDERGUY and RADARBUSTERS... Hands down, best and fastest service and will give the lowest prices. Ive owned the bel lp-904, lp-905 (same as the escort zr3) jammers and still love their radars. But just got a blinder m27 dual jammer for my small compact car and has really left escort in the dust since 2008 in my opinion. Blinder offers on newer models(m27 and now hp-905) firmware upgrades, adjustable jam modes and parking sensor) which is cool cause new laser guns come out and you will be stuck with whatever the escort zr4 shifter has programmed...where the m27, all you do is plug in computer and download. Very cool. Tested with the tester offered through Blinderguys website and has like 16 different pulse rates of labeled guns to test fire your jammers to make sure they are firing but also recognizing all the guns currently used) Just installed a week ago, all leds firing...parking sensor works...great to go with my rx65. The best led jammer out there today. Now yes there is one company i believe the LI interceptor which is costly and uses real laser dioded-much stronger and costs alot more. But Blinder countered with there new laser diode hp-905 system for a cheaper price. Basing on their past successes, I will bet this will be a better jammer than anything out there today.
Ive always been a bel/escort guy and still am for the radar...but glad I read up and saw the blinder and bought the m27 model over the zr4 shifter which has failed miserably against many guns. I used to own the lp-905 from bel(same as zr3) and it did work and saved me couple of times in 2005-2007in south florida against the prolaser, but that was a long time ago and alot better guns are out there.
i chose to give up the cool display/integrated with the zr4 platform and chose to get the stand alone blinder m27 and am ready for all guns in operation thanx to the available downloads. Just a thought for those considering which jammer to buy..