The React One Pro by Trophy Ridge sets a new standard for adjustable single pin bow sights! It comes equipped with the exclusive React Technology, which allows you to sight in the React One Pro after only 2 pin adjustments. This innovative design allows the user to makes easy corrections to windage and elevation with its advanced tool-less micro-click dials, and the fiber optic yardage indicators can be used to compensate for various environmental conditions. Other features of the React One Pro include an ultra-bright fiber optic pin and rheostat light for accurate shooting in low light conditions, as well as second and third leveling to strengthen your accuracy over long distances. In addition, the React One Pro ships with 10 custom sight tapes, and a lens retainer ring. Features of the React One Pro: React Technology: can be sighted in after only 2 pin adjustmentsTool-less micro-click dialsFiber optic yardage indicators Rheostat light and ultra-bright fiber optic pin Second and third axis leveling Includes 10 custom sight tapes and a lens retainer ring Trophy Ridge React One Pro .019 LH 1-Pin Black Bow Sight AS701L19