This EOTech Sight features a heads up design that allows both eyes to be open in order to maintain peripheral vision and depth perception while shooting. It features a sleek, low profile design that points naturally. The reticle provides fast target acquisition and precise aiming options. Features an integral Weaver-style base, uses AA batteries and runs for 600 hours on alkaline or 1100 hours on lithium.Specifications and Features: Magnification :1x Field of View (100 yds): 30 yds (28m) at a 4" eye relief Eye Relief :Unlimited Window Dimensions: 1.20" x 0.85" (30 x 23mm) Length/Width/Height: 5.4"x2"x2.25" (137x50.8x57 mm) Weight :10.9 oz (309 grams) Mount: 1" Picatinny (MIL-STD-1913) or Weaver rail Finish :Black