The Burris FastFire E Reflex Sight establishes a new standard in red dots with a 60,000-hour battery life and ultra-rugged monolithic machined aluminum housing. The waterproof, shockproof, and fogproof closed emitter construction protects the emitter from environmental damage and obstructions like snow or mud and is ready for any competition, duty, or hunting setup. Combined with a 3.5-MOA "always on" aiming dot, means the FastFire E maintains reliable operational readiness for any scenario. Features10 Brightness Setting (8 Daylight/2 Night Vision)Sight Window Size: 0.87"x0.67"Up to 60,000 Hour Battery Life While Always Powered OnACRO P-2 Footprint