The Model 512 is the most popular model HWS. This tactical optic is perfect for agencies that want the best in CQB speed and versatility, without the need for night vision compatibility. * AA Battery model (supports Lithium and Alkaline) * Reticle: 65 MOA circle with 1 MOA aiming dot * Includes rugged aluminum hood assembly and knobbed, tool-less mounting bolt * Interfaces to 1"" Picatinny (MIL-STD-1913) or Weaver rail Operation * Optics: Transmission holography - parallax free * Magnification: 1x * Eye Relief: Unlimited * Length/Width/Height: 5.4""x2""x2.25"" (137x50.8x57 mm) * Weight: 10.9 oz (309 grams) * Temperature: -40 to 150 F (using AA lithiums); -20 to 140 F (all other battery choices) * Waterproof: Submersible to 10 ft depth * Sealing: Fogproof internal optics * Adjustment (per ): 0.5 MOA (1/2"" at 100 yds) * Adjustment Range: +/- 40 MOA travel * Mount: 1"" Picatinny (MIL-STD-1913) or Weaver 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 Electrical * Brightness Adjustment Range: 110,000:1 brightest to lowest * No Night Vision Compatibility * 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: 20 settings with scrolling feature * Auto Battery Check Indicator: Flashing reticle upon start-up * Auto Shut-down: At 8 hrs- programmable to 4 hrs * Holographic Weapon Sight * Reticle 65 MOA with 1 MOA Aiming Dot * Includes rugged aluminum hood assembly * Interfaces to 1"" Picatinny or Weaver Rail * Mossy Oak Obsession Camo finish