The utg cqb dot sight is a quick aim electronic dot sight with dual(red/green) illumination.The 38mm tube comes with emerald lens coating for maximum brightness and clarity, consistent and precise coin-adjustable w/e knobs with 1/2 moa per click increments this model includes an integral picatinny mounting deck and flip-open lens caps.Battery Size: CR2032Magnification: 1xObjective: 39.2mmField Of View: 95 ft @ 100 ydsEye Relief: InfinityDot Size: 4 MOATube Diameter: 38mmLength: 3.76"/95.504mmWeight: 9.40 oz/266.5 gFinish: Black Hardcoat AnodizedReticle: 4.0 MOA Red/Green CQB DotAdjustment Size: 0.50 MOAOptic Coating: Emerald Multi-CoatedWindage Elevation: Adjustable