The Leapers' Scope UTG SCP3-P3124AOMDL EZ-TAP 30mm SWAT 3-12X44 Full Size A.O. Range Estimating Mil-Dot RGB EZ-TAP Illuminated Scope features a 30mm Tube for Maximum Light Transmission and a Unique One-Piece Tube Construction for Superior Shockproof, Fogproof, and Waterproof Capabilities, Completely Sealed and Nitrogen Filled to Prevent Fogging. The scope has Premium Zero Lockable and Zero Resettable Target Turrets with the Most Consistent and Precise Windage/Elevation Adjustment Etched Glass Mil-Dot Reticle for Reliable and Effective Range Estimating. The User-friendly EZ-TAP Illumination System with Red, Green, and Black Reticle-High-tech Memory Feature for Quick and Easy Adjustment to the Preferred Brightness, Rapid Switch Between Red and Green Illumination, and Maintaining the Brightness Last Used When Changing Reticle Color or Turning Light Back On. Smooth Adjustment of 7 Different Levels of Brightness for the Most Diverse Weather/Light Conditions. Side Wheel Adjustable Turret Parallax Adjusts from "True 10 Yards" Up; Side Wheel Prepared for Optional Big Wheel for Finer Parallax AdjustmentOptimal and Precise Windage/Elevation Adjustment Range High quality sun-shade and flip-open lens caps deliver shooting accuracy, clarity, consistency, and ultimate performance.