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 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.3 MOA Red-Dot with multiple intensity settings ensures rapid target engagement under a full range of lighting conditionsMOTAC(TM) (Motion Activated Illumination) powers up when it senses motion and powers down when it does not provides for optimum operational safety and enhanced battery lifeTested to maintain its zero at over 10,000 rounds of 230 grain, .45 ACP.The readily available CR1632 battery is top-loading, allowing for quick battery replacement without having to remove the sight from the firearmExtremely strong and lightweight CNC Magnesium housing ensuring a lifetime of reliable serviceDependable waterproof (IPX-7 rated for complete immersion up to 1 meter) and fog-proof performance