The Romeo1Pro 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 yo fast, responsive target acquisition and accuracy. The Romeo1Pro includes a ruggedized protective shroud in the box for extreme durability. Features: Molded glass aspheric lens with high performance coatings for superior light transmittance and zero distortion 3 MOA red dot with multiple brightness settings for rapid target engagement under a full range of lighting conditions TruHold Lockless Zeroing System that utilizes twin adjustment springs designed to endure handgun recoil and return to zero shot after shot New point-source emitter provides exceptional brightness with 12 settings (10 Daytime/2 Night Vision), and 20,000+ hours of runtime MOTAC (Motion Activated Illumination System) that powers up when it senses motion and powers down when it does not Aircraft-grade CNC aluminum housing ensures a lifetime of reliable service Dependable waterproof (IPX-7 rated for complete water immersion up to 1 meter) and fogproof performance Ruggedized protective steel shroud included for extreme durability Easy access to the battery compartment Sig Sauer Electro-Optics Infinite Guarantee and Sig Sauer Electronic Component Limited 5-Year Warranty Compatible With: M17 M18 P320-M17 P320 XFive Legion P320 XCompact P320 XFull All Pro-Cut Slides P320 Pro Series Specifications: RX Footprint: Pro Height: 27.4mm Magnification: 1x Objective Lens Diameter: 30mm Overall Length: 46.5mm Overall Width: 31.7mm Illumination Settings: 10 Daytime / 2 Night Vision Total Elevation Travel: 100 MOA Total Windage Travel: 100 MOA Run Time: 20,000 Hours Battery: 1- CR1632 Emitter: Open