Probably the most popular HWS model out there the EOTech 512.A65 is one amazing piece of modern technology. With transmission holography optics parallax free this sight offers amazing visibility. The eye relief is unlimited and at 4 inch setting it offers a 30 yard field of view. The front window is made from thick glass to withstand any shock and damage while the rear window is made out of resistant laminate. - The design is very light weighing in only at 10.9 oz (309 grams) so as not to burden the user with useless weight like some other models do. The EOTech 512.A65 works optimally in temperatures between -40 and 150 F if AA lithium batteries are used. These temperatures rise to -20 to 140F if the operator chooses a different type of batteries. The sight is after all compatible with Alkaline and rechargeable batteries aside from the aforementioned AA lithium batteries. The sight works for 1000 continuous hours with the recommended lithium batteries. - The EOTech 512.A65 can be used at any daylight brightness both in twilight and broad sunshine. It has twenty different brightness settings to choose from which can be easily manually adjusted in a matter of seconds. All electronics of the EOTech 512.A65 are protected by a special casing making sure your sight will continue working even in very bad conditions. - This accessory's popularity speaks for itself so you know that what you get is what most experiences weapon users want. Get your own EOTech 512.A65 from our site and you won't regret it! - AA Battery model (supports Lithium and Alkaline) - 65 MOA circle with 1 MOA aiming dot reticle pattern - Includes rugged aluminum hood assembly and knobbed tool-less mounting bolt - Interfaces to standard 1 Weaver dovetail / Picatinny rail - Operation - Optics: Transmission holography - parallax free - Magnification: 1x - Eye Relief: Unlimited - Length/Width/Height: 5.4x2x2.25 (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 click): 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: 110000:1 brightest to lowest - No Night Vision Compatibility - Power Source: 2x 1.5V AA batteries (supports lithium alkaline or rechargeable) - Battery Life: 1000 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