The Sig ROMEOZero Micro Reflex Sight is the fastest, most accurate, ultra-compact micro reflex sight for everyday concealed carry and pistols with slim slide profiles. The sight features a ruggedized, WeaponsGrade textured polymer body and the SpectraCoat HD Polymer lens system. The ROMEOZero features SpecraCoat HD polymer lens with 10 times the impact resistance over traditional glass lenses WeaponsGrade Ultralite Polymer housing optimized for use with Polymer pistols, concealed-carry and also slim slide profiles such as single-stack 1911s, and sub-compact firearms; Stippling pattern on the housing matches P365 and P365XL grip pattern, for an integrated look; 8 vivid, user configurable daytime illumination levels MOTAC (Motion Activated Illumination System) that powers up when it senses motion and powers down when it does not; parallax free; highly efficient, point source LED emitter for a crisp dot that is 8 times more efficient than conventional red dots. 10 year battery life unrivaled in a micro reflex sight. Assembled in USA.