Closed red dot sight with 50000+ hr battery life; Designed for modern semi-automatic pistols, MSR platforms and shotguns; Comes standard with solid and see-through lens covers and quick release mount; 50000+ hr 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, IPX7 rated, and fogproof