Trijicon TR20-2 AccuPoint 3-9x40 Riflescope with MIL-Dot Crosshair with Green Dot Reticle, 1 in. Tube SUPERIOR QUALITY LENSES: Multi-coated lenses provide superior clarity and light gathering capabilities with zero distortion BATTERY-FREE ILLUMINATION: Fiber optic technology automatically adjusts the brightness level and contrast of the reticle aiming point to available light conditions and a tritium phosphor lamp illuminates the reticle in low to no light AIRCRAFT-GRADE ALUMINUM HOUSING: All-weather rugged construction protects against the toughest elements SECOND FOCAL PLANE RETICLE: Reticle size remains constant as magnification increases which provides a more exact aiming point at higher magnifications ZERO FORWARD EMISSION: The illuminated reticle doesnt project any illumination from the objective lens