30mm 1 Piece Tube for Maximum Light Transmission. Built on True Strength Platform, Completely Sealed and Nitrogen Filled, Shockproof, Fogproof and Rainproof. Provides Amazing, True and Consistent Extended Eye Relief for Shooters to Effectively Use on Any Firearm Where the Optics Cannot be Mounted Directly Above the Action. 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. Premium Zero Locking and Zero Resetting Target Turrets with Most Consistent and Precise 1/4 MOA per Click Windage/Elevation Adjustment. Emerald Coated Lenses to Achieve Maximum Light Transmission for Best Clarity. Unique 6 Mil-dot Tactical Range Estimating(TRE) Etched Glass Reticle for the Ultimate Performance. Side Wheel Adjustable Turret(SWAT) for Parallax Adjustment from "True 10 Yards" Up, and Ready to Accept Optional Big Wheel to Achieve Finer Parallax Adjustment. Practical TactEdge Angled Integral Sunshade. Complete with Twist Lock Medium Profile Picatinny/Weaver Rings and High Quality Flip-open Lens Caps.