The Trijicon Miniature Rifle Optic (MRO ) is a reflex-style, sealed sight intended for use on rifles, carbines, and shotguns to provide fast target acquisition. It is designed to be used with both eyes open, providing the operator with maximum situational awareness. The large aperture and tapered light path maximizes the viewing area in such a small optic, allowing for fast target engagement especially from non-standard shooting positions. It also features ambidextrous brightness controls, sub-flush adjusters, advanced lens coatings, and a fully sealed, waterproof, hard anodized forged 7075-T6 housing, making the MRO the ultimate mini reflex sight. The MRO HD is optimized for use with a magnifier, with a re-engineered objective lens to produce a refined 2.0 MOA center dot surrounded by a 68 MOA segmented circle reticle. The ambidextrous reticle and brightness control allows the user to choose between a full reticle or center dot only. Product Specifications Length x Width x Height: 2.9 in x 1.7 in x 3 in (73.66mm x 43.18mm x 76.2mm) Weight: 6.4 oz. (181.44g) Magnification: 1x Objective Size: 25mm Day Reticle Color: Red Illumination Source: LED Illumination Settings: 16 Total Power Source: CR2032 Battery Life: 2.5 Years of continuous use at dot-only day setting "3" (Setting 5 of 8) at 70F (21C); 75 days of continuous use for complex reticle at day setting "3" (setting 5 of 8) at 70F (21C) Adjustment Range: 70 MOA Eye Relief: Infinite in. Mount: Full Co-Witness Mount Housing Material: 7075- T6 Forged Aluminum Finish: Matte Black Submersion Depth: 100 ft. (30m) Operating Temperature: -60F to +160F (-51.11c to 71.11c)