Built on True Strength Platform, Completely Sealed and Nitrogen Filled, Shockproof, Fogproof and Rainproof 30mm Tube with Best in Class Emerald Lens Coatings to Achieve Maximum Light Transmission for Best Clarity Premium Zero Lockable and Zero Resettable Target Turrets with Most Consistent and Precise 1/2 MOA per Click Adjustment Designed with Etched Glass PRO 4-Step Projectile Drop Compensation(PDC) Reticle for Quick Aiming at 20, 30, 40 or 50 Yard Distances in Crossbow or Other Compatible Applications Tool-free Index Ring to Adjust Point-of-Impact Compensation per 275 - 385 fps for Optimal Aiming and Shooting Performance Innovative EZ-TAP Illumination Enhancing (IE) System with Red/Green Dual-Color Mode and 36 Color Multi-Color Mode to Accommodate All Weather/Light Conditions 1-Click High-tech Illumination Memory Feature Gets You Right Back to the Color/Brightness Setting Last Used Parallax Preset at 35 Yards Complete with TactEdge Integral Sunshade, UTG Max Strength Picatinny/Weaver Rings and High Quality Flip-open Lens Caps