Quick Aim Electronic Dot Sight with Red/Green Dual Illumination; 38mm Tube with Best in Class Emerald Lens Coating for Maximum Brightness and Clarity; Consistent and Precise Coin-adjustable W/E Knobs with 1/2 MOA per Click Increments; Clear and Sharp 4.0 MOA Dot; Optimal Brightness Settings for Variable Shooting Environment; Great Field of View and Unlimited Eye Relief; Includes Integral Picatinny Mounting Deck and Flip-open Lens Caps