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. Features: Length x Width x Height: 2.9 in x 1.7 in x 3 in (73.66mm x 43.18mm x 76.2mm) Weight: 5.6 oz. (158.76g) 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: Low 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)