I believe each number represents 10 yds. Theoretically, if you have it on "2" and sight your red dot in at 20 yds, you should be able to turn it to "3" and be on at 30 yds. If you disable the D-A-R and put an Excal V-zone on it, you will see a whole new world, lol. Dead on from 10-50 yds.