Sig Sauer ROMEO5 Compact Red Dot Sight 1x 20mm 1/2 MOA Adjustments 2 MOA Dot Reticle with M1913 Co-Witness Picatinny Mount Black ROMEO5 compact red dot sights provide civilians and armed professionals a robust 1x aiming solution for any solution. Ultra-low parallax so point-of-aim is point-of-impact and the red dot remains parallel to the bore of your firearm, no matter what your viewing angle is relative to the optical axis of the sight. Unlimited eye-relief allows you to acquire the aiming point and the target regardless of the position of your eye behind the sight. The readily available CR2032 battery is side-loading, allowing for quick battery replacement (featuring 40,000+ hours or more of life). Dependable waterproof (IPX-7 rated for complete water immersion up to 1 atmosphere) and fog-proof performance. Features: 2 MOA Red-Dot provides 10 illumination settings (8 daylight plus 2 NV) for visibility in all light conditions MOTAC (Motion Activated Illumination) powers up when it senses motion and powers down when it does not Integrated M1913 Picatinny interface provides industry-standard mounting options for a wide range of applications Dependable Waterproof and fog-proof performance Includes mount