Always ready - always on. Turn it on for up to 3 years using one single battery. No need to fumble with switches prior to use; 2 minute of angle red dot for accurate target engagement at all distances; In service date and battery change date reminders makes inventory tracking and maintenance easy; Enhanced speed on target and increased first shot hit probability when compared to iron sights and magnified scopes; Compatible with all generations of night vision devices and may be used with Aimpoint 3X Magnifier and Concealed Engagement unit; Hard anodized aluminum alloy housing. Rugged enough for real world conditions and waterproof to 150 feet; Threaded front lens opening allows use of screw-in anti-reflection device (ARD); Front and rear flip covers keep lenses clean; Transparent rear flip cover allows use of the sight (with both eyes open) even with both covers closed in an emergency; Recessed lens openings helps prevent against impact damage, fingerprints and scratches