Both of the scopes have that feature the way it works is as you increase the number on the speed ring the bow will shoot lower but this only moves arrow impact beyond 20 yards nifty huh what is really neat you can have your bow sighted in at say 60 yards on the bottom post of a lumizone move the speed dial back from 350 to about 250 and that same post with the same arrow will be on at say 75 or 80 yards makes long range plinking a lot of fun