The ROMEO1 Miniature Reflex Sight is the ideal sighting solution for the modern semi-automatic pistol, 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 ensuring a lifetime of reliable service. Dependable waterproof (IPX-7 rated for complete immersion up to 1 meter) and fog-proof performance.