The Trijicon MRO SD Red Dot series features a large aperture maximizing the viewing area, allowing for better situational awareness and fast target engagement. 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. FeaturesAmbidextrous ControlsTop Loading BatteryFull Multi-Coating LensesMount Included Based on SelectionBattery Life: 2.5 Year (Red Dot), 3 Years (Green Dot)8 Brightness Settings (5 Day, 2 Night Vision, 1 Super Bright)