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.