The DRS1X lives up to its namesake with rapid and lethal target engagement at close quarters.The DRS (Defendu Reflex Sight) is so versatile and effective at close range, we've named it after the famed Lt. Colonel William Ewart Fairbairn whose Close Quarters Combat system was designed to rapidly disable an opponent with potentially lethal force. Perfect for tactical operations or home defense, the 1x reflex sight offers three reticles calibrated for speed and accuracy at 7, 25 and 50 yards.The ultimate CQB sight, it is built with Steiner's legendary ruggedness. Lightweight, compact and simple to use.Included Accessories: Battery, Lens Cloth, User GuideWindow size is .96 x 1.26 in. (height x width).The overall height is 2.57 in., and it sites 2.35 in. above the rail.Features:Rugged Magnesium BodyChoose From 3 Reticle OptionsA Single DotDot And Stadia LinesDot, Stadie Lines And Close DotSeven Illumination Levels (4 Day/3 Night)Adjustable For Windage/ ElevationWaterproof/fogproof/ ShockproofPowered By Two (2) AA Batteries, But Can Operate On One2000+ Hours Of Battery Run Time13-hour Auto ShutoffCo-witness With Iron Sights Or Use With Any MultiplierSpecifications:Reticle Color(s) RedFinish Matte BlackMount MIL-STD 1913Click Value 05 MOAElevation Adjustment, Total Capability 50 MOAWindage Adjustment 1/2 MOALength 3.88 inWeight 10.4 ozIllumination Settings 7 illumination settingsBattery 2x AA | 3000 HRSSpecial Features 3 reticle modes