The Trophy Ridge React One Pro 1-Pin Sight combines innovative React Technology with all of the efficiency of a high-end target sight to deliver performance year after year, hunt after hunt. React Technology accurately predicts what each pin gap will be based on the distance between your 20-yard pin and any other yardage and is effective from 330-265 fps. Once you have two pins sighted-in accurately, the rest of your pins will be automatically set, it's that easy! The React One Pro also features fiber optic yardage indicators, 2nd and 3rd axis adjustment, and tool-less micro-click windage and elevation adjustments. Its 100% construction and stainless steel hardware stay light without sacrificing on strength.