30mm Tube with Best in Class Multi Emerald Coated Lenses to Achieve Maximum Light Transmission for Best Clarity. Built on True Strength Platform, Completely Sealed and Nitrogen Filled, Shockproof, Fogproof and Rainproof. 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. Most Innovative, Low Profile Illumination Control with 2 Soft and Ergonomic Control Buttons Designed for Most Natural, Smooth and Quick-reaching Hand/Finger Operations. Special Circuit and Housing Design for Uninterrupted Illumination Even Under Heavy Recoil. Premium Zero Locking and Zero Resetting Target Turrets with Most Consistent and Precise 1/4 MOA per Click Windage/Elevation Adjustment. Side Wheel Adjustable Turret (SWAT) for Parallax Adjustment - from 10 Yards to Infinity; Side Wheel Ready for Optional Big Wheel to Achieve Finer Parallax Adjustment. TactEdge Angled Integral Sunshade Complete with Flip-open Lens Caps and High Quality Max Strength Twist Lock Picatinny/Weaver RingsFeatures : 30mm tube with multi coated lenses Nitrogen filled, shockproof, Fogproof, rainproof Red/green dual-color mode 1 click high-tech illumination memory