Sig Sauer ROMEO1 Miniature Reflex Sight is the ideal sighting solution for the modern semi-automatic gun. Features a molded glass aspheric lens with high performance coatings for superior light transmittance and zero distortion. Manual illumination controls remember your last used settings. Three MOA Red-Dot with multiple intensity settings ensures rapid target engagement under a full range of lighting conditions. The readily available CR1632 battery is top-loading, allowing for quick battery replacement without having to remove the sight from the firearm. Extremely strong and lightweight aircraft grade CNC Magnesium housing ensuring a lifetime of reliable service. Dependable waterproof (IPX-7 rated for complete immersion up to 1 meter) and fog-proof performance. FEATURES: Available with a universal mount with rear sight dovetail adapters for the most popular handguns on the market 3 MOA Red-Dot with multiple intensity settings ensures rapid target engagement under a full range of lighting conditions Tested to maintain its zero at over 10,000 rounds of 230 grain, .45 ACP Available in Pistol Adaptor Pack The readily available CR1632 battery is top-loading, allowing for quick battery replacement without having to remove the sight from the firearm TECH SPECS: Magnification: 1x Objective Clear Aperture: 30 mm Reticle: 3 MOA Red Dot Adjustment Increments: 1.0 MOA Battery: (1) CR1632 Contains: the Romeo1 unit plus the "Handgun Adapter Pack" mounting plates / dovetails