I've got an Escort Passport 8500 X50. I got my RD in 2005 or 2006 and never made any adjustments on it. I simply got it out of the box and attached it to the visor and left it on AUTO. The DIM button is the only button that I've ever messed with. Then I ran across my carrying case for it and decided to check it out online. Thats how I found this very informational forum. I had no idea of the potential my RD has. Of course I have the older one I believe. QKL8500. I haven't tried to read the version yet. Thank ya'll for all your helpful info. I hope to make my RD perform to it's full potential.