The Romeo3 Miniature Reflex Sight is an ideal sighting solution for MSR/AR rifles, shotguns, carbines, submachine guns, and full-size handguns. This sight features a high transmittance red notch reflector for excellent brightness, light transmittance, and zero distortion. A 3 MOA Red Dot with multiple intensity settings ensures rapid target engagement under a full range of lighting conditions. Featuring Sig's MOTAC (Motion Activated Illumination System) that powers up when it senses motion and powers down when it does not, the Romeo3 provides optimum operational safety and enhanced battery life. The readily available CR2032 battery is side-loading, allowing for quick battery replacement without having to remove the sight from the firearm. This sight is housed in extremely strong and lightweight aircraft grade CNC Aluminum which ensures a lifetime of reliable service, and gives dependable waterproof and fogproof performance.