Kraken is fully sealed, closed emitter dot sight optimized for defensive and law enforcement use on pistol and long gun applications. Compared to open emitter reflex sights, sealed systems like Kraken are tougher and easier to keep clean and functional in extreme conditions such as immersion in water or mud. Kraken features 3 MOA dot available in Red and includes battery-saving Shake n’ Wake technology. 3 MOA Dot, powered by CR2032 3V battery. 8000+ hours continuous battery life / 20000+ hours with Shake n’ Wake use. Motion sensing “Shake n’ Wake” auto-on / auto-off reticle illumination. 7075-T6 aluminum construction and hardcoat anodized finish. Device Type: Closed Emitter Dot Sight. Windage and Elevation Range: 90 MOA. Battery Type: CR2032 3V. Dot Size: 3 MOA. Scope Body: Matte Black Hardcoat. 7075-T6 Aircraft Grade Aluminum. Optical Coating: Fully Multi-Coated. Weight: 2.4 Ounces w/o Battery. Working Temperature: -4°F to +140°F. Dot Brightness: 10 settings, 2 NV. Water resistance: IPX7, up to 1 Meter. Dimensions: 1.86″X 1.4″ X 1.2? 2 Yr Real Worid [Shake’N Wake].