What happens when you combine a state of the art illumination system with the exclusive FireDot Reticle? You get the VX-Râ€”only from Leupold, America's Optics Authority. Quantum Optical System. Index matched lens system. DiamondCoat. 2nd generation Argon/Krypton waterproofing. Lead free. Generous eyebox. FireDot illumination. Blackened lens edges. Twin bias spring erector system. One turn, extended range focus. 3:1 zoom ratio. Custom Dial System (CDS). Ballistic Aiming System (BAS). Motion Sensor Technology (MST). 1/4 MOA finger click. Extended battery life. 30mm maintube. Tactile power selector. 6061-T6 Aircraft quality aluminum.