The EOTech EXPS2 Holographic Weapon Sight is renowned for its ability to function in extreme conditions. The holographic image sighting technology also gives you true "2 eyes open" heads-up display and wide, unlimited field of view. These EOTechA(R) Sights are small, fast and lightweight... without sacrificing an ounce of functionality. Improved battery life over previous models means they won't power down before you do, either. Don't go with anything less on your next mission! Waterproof and fogproof Nitrogen-purged optical cavity Front windows are solid glass, rear is shatter-resistant laminate Scroll through 20 brightness settings for visibility in any environment Fits to standard 1" WeaverA(R) style dovetail or Picatinny rail Rugged aluminum hood assembly Tool-less mounting bolt Auto shutdown Non-reflective hardcoat finish The best in lightning sighting! Order now!