The Eotech 552 A65/1 Holographic sight is Eotech's night vision compatible, "AA" battery powered model. NSN 1240-01-492-5264 Standardized by the DEA, ATF, and FBI SWAT, the Model 552 is by far the most popular HWS model. This NV compatible, AA battery model is the sight of choice by military units like Stryker Brigade, 10th Mountain, and 3rd Infantry. It is battle proven to withstand the abuse that any harsh environment, high powered weapon platform, or military mission can dish out. Compatible with Gen I-IV Night Vision Systems (Tandem Operation) AA Battery model (supports Lithium and Alkaline) 65 MOA ring/1 MOA dot reticle includes rugged aluminum hood assembly and knobbed, tool-less mounting bolt interfaces to 1" Picatinny (MIL-STD-1913) rail The Eotech 552 Holographic Diffraction Sight is the most advanced weapon sighting system in the world. Utilizing a holographic lens similar to the heads up display used in military fighter aircraft. The Eotech 552 sight has a 1 MOA red dot for precision work as well as a 65 MOA circle for close quarter shooting. The Eotech 552 sight has 20 brightness settings allowing it to work in either bright sunlight or very low light. The aiming red dot is even visible if the lens is broken. When used in Close Quarter Battle(CQB) environments, this revolutionary optic delivers amazing speed and accuracy gains, uncompromised use of peripheral vision, and leaves no muzzle side operator signature. It is covered with an allow hood for extreme durability. It can be removed without tools and works on any weaver/Picatinny rail. Operation Optics: Transmission holography - 100% parallax free Magnification: 1x Eye Relief: Unlimited Length/Width/Height: 5"x1.8"x2.25" (131x49x60 mm) Weight: 11.5 oz (326 grams) Temperature: -40 to 150 F (using AA lithiums); -20 to 140 F (all other battery choices) Waterproof: Submersible to 33 ft depth Sealing: Fogproof internal optics Color/Finish: Non reflective black with hard coat finish Adjustment (per click): 0.5 MOA (1/2" at 100 yds) Adjustment Range: +/- 40 MOA travel Mount: 1" Picatinny (MIL-STD-1913) rail Return to Zero: Repeatable to 1 MOA after re-mounting Heads-Up-Display Window Optical Surfaces: Anti-glare coating Window Dimensions: 1.20" x 0.85" (30 x 23mm) Front Window Material: 1/8" solid glass Rear Window Material: Shatter resistant laminate (3/16" thick) Field of View (100 yds): 30 yds (28m) at a 4" eye relief Standard Reticle: 65MOA circle with quadrant ticks with 1 MOA aiming dot Electrical Brightness Adjustment Range: 146,000:1 brightest to lowest Night Vision Brightness Range: 1280:1 with NV switch engaged Power Source: 2x 1.5V AA batteries (supports lithium, alkaline, or rechargeable) Battery Life: 1,000 continuous hours (lithium) at nominal setting 12; 600 continuous with AA alkaline Brightness Settings: 30 settings with scrolling feature (10 settings for NV use) Auto Battery Check Indicator: Flashing reticle upon start-up Auto Shut-down: At 8 hrs- programmable to 4 hrs