System Parallax Free Reflex Collimator System Unlimited eye relief with no centering required 8 MOA red dot reticle size Scope/frame quality constructed of high quality extruded aluminum, with an anodized graphite gray surface Lens constructed of thermoplastic elastomer, with black non-glare finish Adjustments: 1 click = 10 mm at 80 meters, or 13 mm at 100 meters Built to withstand the harshest terrains and conditions; operable in temperatures ranging from NEGATIVE 50 DEGREES FAHRENHEIT (-50oF) to 160DEGREES FAHRENHEIT (+160oF) Water-proof up to 80 ft. in depth Universal fit to all Weaver rail systems In the Box RD-3000 red dot scope cantilever rail mount microfiber cleaning cloth Specifications: Battery Type One 3 Volt (2032)Battery Life 40-80 hours (avg)Length 130 mm (5.1)Width/height 55 mm (2.2)Ring width Max 30 mm (1.2)Weight 200 grams (7.1 oz) California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov