I noticed that Whistler has another cordless model. It is the xtr-540. I assume this replaces the 1788. What I am wondering is - does the 540 contain the same technology as the 1788. I have never liked my 1788's performance and was hoping for a better performing cordless detector but have yet to find reviews on the 540. Anyone here have any insight. Would eventually love to see a cordless model with the newer Ka-max technology. Of course - if the detector only contains 2 batteries, it may have a duty cycle and cut down performace anyway, but the Ka-max would compensate for a duty cycle somewhat.