Built on True Strength Platform” Completely Sealed and Nitrogen Filled” Shockproof” Fogproof and Rainproof. 1 Inch Tube with Emerald Coated Lens for Crystal Clear View with Maximum Light Transmission. 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 (US PAT. 8437079; EU PAT. EP2520894). 1-Click High-tech Illumination Memory Feature Gets You Right Back to the Color/Brightness Setting Last Used. Premium Zero Lockable and Zero Resettable Target Turrets with Consistent and Precise 1/4 MOA Per Click Adjustment. Range Estimating Mil-dot Reticle for Optimal Aiming and Shooting Performance. Adjustable Objective from 3 Yards to Infinity to Achieve Parallax-free View. Large Field of View (Wide Angle) and Most Accommodating Eye Relief for Optimum Critical CQB Mission. Complete with 2″ Sunshade” High Quality Flip-open Lens Caps and Lever Lock Quick-detachable Rings