Designed for competition shooters and self-defense applications, the Sig Sauer® ROMEO1PRO 1x30mm 3MOA Open-Reflex Sight features a lightweight, streamlined profile, offering a smooth, snag-free draw and holstering. The CNC-machined aircraft aluminum housing delivers lightweight strength and durability, while a rugged steel shroud offers additional protection and strength for lasting performance. Simple push-button brightness controls allow you to quickly cycle through 12 brightness settings (10 daylight; 2 night vision) for optimal visibility in any lighting, while the 3 MOA dot is easily acquired for quick, accurate shot placement. The molded glass aspheric lenses feature durable LensArmor™ coatings for scratch and abrasion resistance, while SpectraCoat™ performance coatings deliver superior light transmission and eliminates distortion for optimal clarity. The TruHold™ Lockless Zeroing System utilizes twin adjustment springs designed to endure punishing recoil and deliver a quick return to zero. MOTAC™ (Motion Activated Illumination System) technology automatically powers up the unit when it senses motion and powers down when the weapon is idle for battery conservation. Offering an impressive battery life of up to 20,000 consecutive hours (lowest setting), the CR1632 battery (included) is easily accessed—without removing the optic from the firearm—via the easy access battery compartment for quick battery changes on the fly. IPX7 waterproof and fogproof. Backed by Sig Sauer’s Electro-Optics Infinite Guarantee™.