Sig Sauer Romeo4 Features: Designed for modern semi-automatic pistols, MSR platforms and shotgunsComes standard with solid and see-through lens covers and quick release mountBallistic Circle-Dot and Ballistic CirclePlex reticle optionsUsers can select from 4 different integrated reticle options50,000+ 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. Uses an ultra-efficient red LED illumination for daylight visibility and extended runtime Strong, lightweight aircraft-grade CNC aluminum housing True co-witness QR mount and low mount includedWaterproof, IPX-7 rated, and fog-proof. Like New Sig Sauer Romeo 4 Red Dot Sight 1x20 2 MOA Circle Dot Torx