Specifically engineered for concealed carry pistol applications, the Holosun HS407K X2 is a compact open reflex sight, featuring a durable 7075 T6 aluminum housing for unmatched strength and durability in virtually any tactical or self-defense environment. This pistol optic boasts a 6 MOA dot reticle with 12 user-selectable brightness settings (10 daylight; 2 night vision) for reliable clarity and intuitive target acquisition in any environment, while simple push-button controls offer intuitive activation and user-friendly field service. The Holosun HS407K X2 boasts Shake Awake technology, automatically activating the reticle when it detects motion for an instant, hands-free activation, and automatically powers down the unit when the weapon is idle, while the Multilayer reflective glass lenses deflect stray light away from your eye for exceptional clarity and reduced eye fatigue. Plus, the Holosun HS407K X2 operates on one CR1632 battery with up to 50,000 hours of battery life. IP67 waterproof.