The TruGlo 4x32mm Tru-Brite Xtreme Tactical Riflescope with Rings is specifically designed for tactical applications with a choice of dual color reticle illumination, or just black Mil-Dot reticle. This enables the user to determine the distance of objects of a known size. The reticle is also useful for providing quick trajectory and wind drift aiming reference. The model with the illuminated reticle has a adjustable rheostat for brightness control. Also featuring Weaver-style rings, rubber eye guard, waterproof, fog-proof and nitrogen gas-filled. They have a generous 4" eye relief and the lense are fully coated for maximum brightness, clarity and contrast.