Description Sig Sauer Romeo 4h Compact Red Dot Sight, 1x20mm, M1913 Rail Interface This sight features a compact design and a durable M1913 rail interface for maximum versatility and control. Features Designed for modern semi-automatic pistols, MSR platforms and shotgunsComes standard with solid and see-through lens covers and quick release mount Ballistic Circle-Dot and Ballistic Circle QuadPlex reticle options Users can select from 4 different integrated reticle options (Dot, Circle-Dot, Dot with Holds, Circle-Dot with Holds) 50,000+ hour battery life and the readily available CR2032 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 True co-witness QR mount and low mount included Strong, lightweight aircraft-grade CNC aluminum housing Waterproof, IPX-7 rated, and fog-proof.- Designed for modern semi-automatic pistols, MSR platforms and shotguns Comes standard with solid and see-through lens covers and quick release mount Ballistic Circle-Dot and Ballistic Circle QuadPlex reticle options Users can select from 4 different integrated reticle options (Dot, Circle-Dot, Dot with Holds, Circle-Dot with Holds) 50,000+ hour battery life and the readily available CR2032 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 True co-witness QR mount and low mount included Strong, lightweight aircraft-grade CNC aluminum housing Waterproof, IPX-7 rated, and fog-proof.