React Technology adjusts your pins and yardage indicators to be spot on at any distance; Tool-less micro-click windage and elevation adjustability; Increase the brightness to suit any shooting condition with the rheostat light; Three pins allow you to have set 20, 30, and 40 yard pins, then dial precise yardage at extended range; Positive stop design at the 40-yard indicator position; Durable 100% machined-aluminum construction; Includes Digital React One Pin sight, 6-foot USB charging cord and plug, optional backup sight tapes and yardage indicators, quick-start guide, and detailed manual for customizing your set up