TruGlo Tru Brite Illuminated Crossbow Scope with Mounting Rings. Illuminated glass etched trajectory compensating reticl with five brightness setting in two colors. Reticle can be calibrated to work with crossbows from 225-400 plus fps and hit targets from 20-50 yards. Reticle can be used in black without illumination. Waterproof, fogproof, nitrogen gas filled. Shock resistant to 1000g. See-thru/flip up lens caps, optical quality/ all weather. Rubber coated, speed focus eye piece. Easy zero-in. Multi coated lenses provide maximum brightness, clarity and contrast even in the poorest of light conditions. Durable coil spring for windage and elevation adjustments. Rheostat with adjustable brightness intensity. Resettable windage and elevation drums. One-piece tube made of aircraft quality aluminum. Durable, scatch resistant, non reflective matte finish. CR2032 lithium battery. Limited lifetime warranty. TruGlo Tru Brite illuminated crossbow scope with mounting rings.