Specifically designed for concealed carry applications, the all-new Sig Sauer ROMEO-X Compact Red Dot Open Reflex Sight is built to handle the vigor of combat and concealed carry without forfeiting clarity or quality. Inspired by the Mil-Spec ROMEO-M17 optics family, this handgun optic boasts a lightweight and virtually indestructible forged 7075 aluminum housing with a patent-pending Beryllium Copper flexure arm for unparalleled shock resistance, lasting stability, and superior zero retention. The distortion-free aspherical lenses deliver incredible clarity with optimal light transmission, and the illuminated dot reticle, coupled with 15 user-selectable brightness settings (12 daylight, 3 night vision), ensures quick, intuitive target acquisition in any lighting condition. MOTAC motion-activated illumination technology automatically activates the reticle emitter when it senses motion for lightning-fast, hands-free performance in self-defense scenarios. The low deck height allows for effortless co-witnessing with standard-height iron sights, and simple push buttons deliver smooth, user-friendly manual power control. To top it off, the ROMEO-X Compact red dot sight boasts an impressive battery life of up to 20,000 hours on a single CR1632 button battery (included). IPX7 waterproof. Compatible with P365 and Shield RMSc footprints.