The Sig Sauer Romeo 3 reflex sight is the ideal sighting solution for MSR rifles, shotguns, carbines, submachine guns, and full-sized handguns. The proprietary red-notch coating ensures a bright red dot, perfect for those moments when you barely have time to blink. The Romeo3 features a top-loading CR1632 allows quick battery replacement without removing the sight from the firearm. Extremely strong and lightweight 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 fog-proof performance.Features: Includes Picatinny low-rise mount and QD 1.41" co-witness riser mount 3 MOA red dot Powered by (1) CR1632 battery CNC aluminum housing IPX-7 rated Fogproof Elevation/Windage adjustment range: +/- 100 MOA Illumination settings: 9 daytime - 2 night vision Weight: 1.4 oz Backed by the SIG Sauer Electro-Optic Infinite GuaranteeSIG Sauer is a world renowned firearms manufacturer with a rich history of innovation and design leadership. No other firearms manufacturer is so highly regarded and so universally respected for the quality, reliability, and safety of its products.