Just got a new XTR690 REV C for a family member so they do not have to deal with $39 cobra crap detector any longer. Taking it off the road today so one leak leaky junky detector out there.
It appears that there have been some updates on the various settings to the LCD display settings that don't match the wording in the owners manual.
I'm guessing that each selection lists the two degrees of display when 1)no alert is being detected and 2)when alert is received.
I have the Pro78 for myself and like the LED display better, but got a good deal on the XTR690 from authorized seller so got it.
Really like the performance of the pro78/XTR690 for the money. Very quiet but get the job done.