30mm Tube with Best in Class Emerald Lens Coatings to Achieve Maximum Light Transmission for Best Clarity. Built on True Strength Platform, Completely Sealed and Nitrogen Filled, Shockproof, Fogproof and Rainproof. 4X to 16X Power with Quick Power Selector Ring Perfect for Target Acquisition and Zooming In. 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 Lockable and Zero Resettable Target Turrets with Most Consistent and Precise 1/4 MOA per Click Adjustment. Side Wheel Adjustable Turret (SWAT) for Parallax Adjustment - From 10 Yards to Infinity. Mil-dot Range Estimating Reticle with Built-in TactEdge Angled Integral Sunshade for Most Optimal Aiming and Shooting Performance. Complete with UTG Max Strength Twist Lock Picatinny/Weaver Rings and High Quality Flip-open Lens CapsFeatures : 30mm tube Shockproof, Fogproof, rainproof Red/green dual-color mode 1 click high-tech illumination memory Side wheel adjustable turret 4X-16X power