Red 3 MOA Dot For the RMSc/407k/507k Footprints (EDG) Enclosed, Duty Grade Shake Awake/Motion Deactivated Standby Up to 50,000 Hours of battery life IPX7 waterproof Side Mounted CR1620 Battery Drop-Proof(6', 35oz, Concrete) Window Size - 23x16mm or 0.9"x0.63" Parallax Free 8 Daytime Settings/2 Night vision Settings   CAT EDG. Built to Survive. Ready to Fight.The Cyelee CAT EDG is a fully enclosed red dot made for tough jobs and harsh places. It is waterproof, fog-proof, and sealed against dust. Rain, mud, or sand will not stop it. Its enclosed design protects the LED and electronics from dirt, water, and bumps. You get a clear and sharp view every time, even in bad weather. Made from strong 7075 aluminum, the CAT EDG is tested for hard drops on full-size pistols. It is ready for daily carry, range days, or duty use. When you need a red dot that will not quit, the CAT EDG is built to keep going. Window - 23x16mm or 0.9"x0.63"