Rugged dependability meets streamlined design with the all-new ROMEO-X Enclosed pistol red dot from SIG SAUER. Leveraging SIG's experience developing durable red-dot technologies trusted by militaries around the world, the ROMEO-X Enclosed optimizes strength and reliability for the concealed environment. Featuring a rugged 7075 aluminum housing with a fully enclosed, sealed, and Argon-purged optical system, the ROMEO-X Enclosed creates a rock-solid, distortion free, aiming solution for the most demanding shooters and circumstances. Equipped with a side-mounted battery compartment and SIG SAUER's patent-pending beryllium copper flexure system, the ROMEO-X Enclosed's deck height is the lowest in the industry, allowing for effortless co-witness with standard height irons and is available in both PRO and COMPACT standardized footprints. Building up SIG SAUER's DNA of trusted military innovation, the ROMEO-X Enclosed delivers streamlined dependability without compromise. ROMEO-X Enclosed. Where X marks the dot. Fully enclosed, sealed, and Argon-purged optical system. Inspired by MIL-SPEC ROMEO-M17 Rugged 7075 aluminum housing Patent-Pending Beyllium Copper Flexure Arm. Distortion free aspherical lens. MOTAC (Motion Activated Illumination) Low deck height for standard-height iron sight co-witness. 20,000 hour battery life with side load battery. 15 illumination settings including 3 night vision. Assembled in U.S.A.