Sig Sauer ROMEO8H 1x Red Dot - 2 MOA Ballistic Circle Dot - Designed for modern MSR platforms and shotguns Features Users can select from 4 different integrated reticle options (Dot, Circle-Dot, Dot with Holds, Circle-Dot with Holds); 100,000+ hour battery life and the readily available CR123A battery is side loading for quick battery replacement.; Unlimited eye relief to acquire aiming point and target, regardless of eye position behind sight.; MOTAC (Motion Activated Illumination) powers up or down when sensing motion; Uses an ultra-efficient red LED illumination for daylight visibility and extended runtime 1.535in Mount Height; Strong, lightweight aircraft-grade 6061-T6 aluminum housing Waterproof, IPX-7 rated, and fog-proof.;