art4242 covered it all basically ...just to add that the "R" designated radio's trigger potentiameter unit is a different more advanced and much more sensitive unit and it does make a noticeable difference, I had a chance to test them back to back just by changing the trigger unit on the radio and driving the same car.
Also a heads up that if you're thinking about picking up a new KO radio their new model with lay down trigger design and other improvements is about to be released in the coming months . Search KO Propo EX-LDT radio system on redrc to check it out.
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