The VX-3 is loaded with optical technology: Xtended Twilight Lens System, DiamondCoat 2 lens coating, blackened lens edges, second generation waterproofing, and a twin bias spring erector system. Finger-adjustable, cryogenically treated, ¼-MOA click windage and elevation adjustments with resettable pointer dials marking the zero point. Tactile power indicator also features built-in range estimation functions and graphite O-rings for easy operation. Incredibly rugged, with absolute waterproof integrity using Leupold's proprietary Argon/Krypton gas blend. Covered by the Leupold Full Lifetime Guarantee.