This Leupold VX-R 4-12x40mm scope with FireDot 4 reticle features a quantum optical system, index matched lens system, 2nd generation argon/krypton waterproofing, generous eyebox, FireDot push button illumination, blackened lens edges, twin bias spring erector system, one turn extended range focus, motion sensor technology, extended battery life, tactile power selector, and 6061-T6 aircraft quality aluminum.