Desciption The Sig Sauer ROMEOZero-PRO 1x30mm Red Dot Sight features the lightweight polymer design of the ROMEOZero line of micro-reflex optics in a full-size pistol optic with premium features. The ROMEOZero-PRO is compatible with SIG SAUER ROMEO1 PRO optics-ready pistols. This new full-size reflex optic features a large 30mm aspherical lens made of scratch-resistant glass giving the shooter unmatched clarity and a distortion-free sight picture compared to competitors. The ROMEOZero-PRO features a proprietary carbon-infused polymer housing with a reinforced lens protection area making it incredibly durable while delivering significant drop and impact protection. It also comes with a hardened steel protective shroud for even greater protection and durability. The ROMEOZero-PRO is available with a 3 MOA red dot or the versatile circle/dot reticle. With Motac technology the ROMEOZERO-PRO will turn on when it senses motion to ensure the reticle is always there for the shot, it will also turn the reticle off when left stationary to save battery life. New T.A.P. (Touch-Activated Programming) technology gives the user the ability to change the brightness by tapping the optic.  All rear surfaces of the housing feature anti-reflection grooves molded in, including a backup rear sight notch which is marked with Grade A Swiss SuperLuminova pigment for visibility in low-light conditions. Specs Magnification Range 1x Objective Diameter 30 mm Weight 0.5 oz Length 1.83" Dot Color Bright Red Dot Size 2 MOA dot w/ 32 MOA circle, 3 MOA Reticle Dot/Circle, 3 MOA Dot Parallax Setting Parallax Free Internal Adjustment 1 MOA Max Elevation Adjustment 50 MOA Max Windage Adjustment 50 MOA Eye Relief Unlimited Weather Resistance Waterproof up to 1 meter of water Mount Type M4 mounting screws Manufacturer Warranty Sig Sauer Infinite Guarantee on the optical system with a 5-year limited warranty on the electronic components