Just read about the differences between SR7 and SR7 Pro and SR7 Plus. The Plus does have the laser jamming capabilities whereas the other SR7 models do not. I'm not sure why Escort even has these if there's the SRX. I just know that those with the SR7 can ADD the ZR3 laser shifting system. I found the pricing for the SR7 Plus and it's about $50 cheaper than the SRX system. I say, just spring for the extra $$$ and go for the best you can get.