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.The Trijicon Miniature Rifle Optic (MRO(R)) HD Magnifier is a 3 power reflex optic magnifier specifically designed to magnify the target and target seen through the MRO HD red dot optic. By magnifying the target the shooter is able to use the crisp dot in the MRO HD to quickly and accurately engage targets at extended distances. The MRO HD Magnifier is short and compact which saves weight and rail space. The design features easy-to-set flush, toolless adjusters that make centering the reticle in the field of view easy. The adjustable diopter allows the user to tune the optical performance to their eyes. Features: Length x Width x Height: 6.25 in x 1.7 in x 2 in (158.75mm x 43.18mm x 50.8mm) Weight: 12 oz. (340.19g) 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 MRO HD ; 60 MOA MRO HD Magnifier Eye Relief: 2.6 in. (66.04mm) Field of View (degrees): 7.2deg Field of View (feet): 37.75 ft. @ 100 yds. (12.58m @ 100m) Mount: MRO HD Full Co-Witness Mount: MRO HD Magnifier Adjustable Quick Release Flip-to-Side Mount Housing Material: MRO HD 7075- T6 Forged Aluminum ; 3x Magnifier Aluminum Finish: Matte Black Submersion Depth: 33 ft. (10m) Operating Temperature:-20F to 140F (-28.89c to 60c)