The ROMEO1 Miniature Reflex Sight is the ideal sighting solution for modern semi-automatic pistols, MSR platforms, and shotguns. 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 or Six 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 ensures a lifetime of reliable service. Dependable waterproof (IPX-7 rated for complete immersion up to 1 meter) and fog-proof performance. Unique footprint to RX line pistols. It does not function with RXP or R2 line handguns and does not have the Delta Point Pro footprint.