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The Sig Sauer Romeo4H is a 1X20mm red circle dot sight designed for modern semi-automatic pistols, MSR platforms, and shotguns. Users can select from 4 integrated reticle options: Dot, Circle-Dot, Dot with Holds, and Circle-Dot with Holds.
It has a 20mm objective lens, .5 MOA adjustment increments, 100 MOA total elevation travel, and 100 MOA total windage travel. It measures 3.3″ long, 1.81″ wide, and 2.5″ high, and weighs 7.6oz. The red reticle has a 2 MOA center dot. Illumination settings are 10 Daytime/2 NV. The sight is waterproof to IPX7 and fog-proof.
The sight uses (1) side-loading CR2032 battery and is specified with a 50000 hour battery life; the description also states 50,000+ hour battery life. MOTAC (Motion Activated Illumination) powers illumination up or down when it senses motion, while an ultra-efficient red LED provides daylight visibility and extended runtime. Unlimited eye relief supports aiming regardless of eye position behind the sight. The strong, lightweight aircraft-grade CNC aluminum housing comes with solid and see-through lens covers, a quick release mount, a true co-witness QR mount, and a low mount.