Built on Robust True Strength Platform with Smart Spherical Structure(SSS) to Achieve Most Precise and Accurate Windage/Elevation Adjustment and Toughest Recoil Resistance Unique Pro 5-Step Red/Green Illuminated Reticle Designed for Crossbows and Other Applications Requiring Variable Velocity Compensation, Includes 5 Horizontal Lines Calibrated for 300fps Crossbows for Quick Aiming at 10, 20, 30, 40 and 50-yard Distances Side Wheel Red/Green Dual Illumination Control for Versatile Uses in Different Light Conditions Superior Quality Precision Broadband Lens Coating Offers the Brightest Image and a Generous Field of View Features Premium Zero Lockable and Resettable Target Turrets for Windage and Elevation Adjustment Complete with Flip-open Lens Caps and Low Profile Quick Detach Ring Mounts with Patented Lever Lock Feature Built in TactEdge® Angled Integral Sunshade Parallax Pre-adjusted at 50 Yards Magnification: 4X Tube Diameter: 1 Inch Objective Diameter: 32mm Field of View @ 100 yards: 27.2' Eye Relief: 3.8" Exit Pupil: 8.0mm Click Value @100 yards: 1/4" Length: 208mm Weight: 12.3 oz Parallax Setting: 50 Yds Batteries: CR1620 3V