This multi reticle optic sight from TRUGLO is lightweight, waterproof, andoffers a wide field of view with unlimited eye relief. It features multi coated lenses,both a red dot and a green dot (with 5 different brightness levels for each), and anintegral Weaver / Picatinny style mount. Two knurled screws offer snug mounting tothe rifle rail. It is powered by a single CR2032 lithium battery (included). Field ofView at 100 Yards is 74′, and Adjustment Click Value is 1″. Length is 3.27″, weight is 5.3 oz., and the aluminum housing is finished matte black.