The ROMEO1 PRO brings a new level of durability and performance to the miniature open-reflex red dot sight. Its aircraft-grade aluminum housing ensures corrosion resistance under the harshest environments, and a new upgraded point-source emitter provides increased brightness in day or night conditions with 12 brightness settings. The molded glass aspheric lens has upgraded high-performance coatings for superior light transmittance and zero distortion-giving you fast, responsive target acquisition and accuracy. PLEASE NOTE: This product is NOT compatible with slides cut to accept a standard ROMEO1. The ROMEO1 PRO is NOT rated for 10mm. 3 MOA red dot reticle 12 brightness settings (10 daylight/2 NV) ALT precision-molded aspheric lens technology for low-distortion optical performance SpectraCoat highly efficient, ultra-wide broadband, anti-reflection lens coatings LensArmor abrasion-resistant lens coatings for extreme durability MOTAC motion activation brings the unit to life with motion Megaview technology for an incredibly wide field of view Aircraft-grade aluminum housing IPX7 rated for waterproof, fogproof performance Truhold twin adjustment springs hold zero through constant recoil Easy-access battery compartment Approx. 20,000 hrs. of runtime Backed by the Infinite Guarantee: SIG SAUER electro-optics are guaranteed foreverFits the following models: M17 M18 P320-M17 P320 XFive Legion P320 XCompact P320 XFull All PRO-CUT Slides P320 Pro Series Order today!