The Sig Sauer ROMEO-X Pro Pistol-Mounted Reflex Sight is built from the ground up with industry-leading functionality. The ROMEO-X is the result of Sig's experience developing durable red-dot technology that's trusted by the military and put into a streamlined civilian package. Featuring a CNC 7075 aluminum housing, intuitive adjustment buttons, a side-mounted battery compartment, and an ultra-low deck height that gives you the ability to co-witness with standard height iron sights. The ROMEO-X boasts direct mounting footprints for your favorite optics-ready pistols. FeaturesInspired by MIL-SPEC ROMEO-M17CNC Machined 7075 Aluminum HousingPatent-Pending Beryllium Copper Flexure ArmDistortion Free Aspherical LensMOTAC (Motion Activated Illumination)Circle Dot With Individually Selectable 2 MOA Dot & 32 MOA CircleLow Deck Height for Standard-Height Iron Sight Co-Witness20,000 Hour Battery Life With Side Load Battery15 Illumination Settings Including 3 Night Vision