There are large window RMR Optics, and then theres the Omega red dot sight. Featuring a huge lens window and competition-ready features, the Omega is designed to speed up target acquisition and improve accuracy without costing you an arm and a leg. Weve engineered the features you need, like a dual-MOA circle/dot reticle, adjustable brightness, and a long battery life thats extended by our innovative low-power mode with shake-to-awake technology, then matched that engineering to materials that are ready for the rigors of field use in dynamic tactical situations. Shoot better with an extra-large window dot sight from a company you can count on to have your six. Specifications for Gideon Optics Omega Red Dot Reflex Sights: Manufacturer: Gideon Optics Color: Black Fabric/Material: 7075-T6 Aluminum Magnification: 1 x Objective Lens Diameter: 27 mm Objective Window Size: 22.3x27 mm Brightness Settings: 10 Eye Relief: Unlimited Adjustment Type: MOA Adjustment Click Value: 1 MOA Emitter Type: Open Parallax: Parallax Free Battery Type: Lithium Metal, CR1632 Battery Quantity: 1 Battery Life: 50000 hours Water Resistance Level: IPX-7 Length: 45 mm Width: 32 mm Height: 26.4 mm Weight: 1 oz Attachment/Mount Type: Picatinny Features of Gideon Optics Omega Red Dot Reflex Sights The large lens on the Omega red dot sight gives you a big sight picture without blocking out your field of viewalways dangerous in a duty or defensive tactical situation. This makes it the perfect pistol optic choice for shooting competitions, range work, as a duty weapon, or as a backup reflex sight on larger firearms. The 7075-T6 aluminum housing is made from the same material often used in components for the m-16 rifle and other firearms. This aluminum alloy is known for its durability in the field under harsh conditions. The massive 22.3mm tall by 27mm wide lens is parallax free to 33 yards and features a bright 65 MOA circle and 3 MOA dot in your choice of red or green. Elevation and windage are adjustable for a total of 90 MOA (45 MOA each) at 1 MOA per click. Designed to fit the popular Trijicon RMR optic pattern common on many handguns. A low-profile 1913 Picatinny mount is also included for mounting on compatible rifles, carbines, PCC weapons, or as a 45-degree offset backup reflex sight. This sight offers unlimited eye relief for quick and accurate targeting. Choose from 10 brightness settings, including 8 for normal light and two night vision compatible settings. A battery-extending low-power mode turns off your emitter after 225 seconds without motion. Any movement, from drawing to a quick wrist shake, reactivates your reticle in milliseconds. The Omega red dot sight is powered by a single CR-1632 3V lithium-ion battery thats easily changeable without removing or re-zeroing the sight, thanks to a convenient top-loading battery tray. Expect a single battery to give you up to 50,000 hours of service life thanks to our energy-efficient features and design. Weighs approximately 1 oz. and measures 45mm x 32mm x 26.4mm (LxWxH). We made this sight shockproof and IPX7 waterproof, so its ready for whatever you throw at it. Package Contents: Gideon Optics Omega Red Dot Reflex Sights A low-profile 1913 Picatinny mount is also included for mounting on compatible rifles Micro fiber clothe and battery included