Fast Focus Eyebell - Allows for quick and easy adjustments when in the field. Tactical Turret - Large oversized tactical turrets in 1/4 MOA adjustments. All tactical models are resettable to zero and designed to withstand extreme environmental conditions. Side Focus - Parallax adjustment designed for quick and easy adjustment and will focus from 10 yards to infinity. Illuminated Rheostat - Designed for low light shooting applications the 11 position rheostat illuminates the center dot to allow quick target acquisition and has easy ?OFF? mode between each intensity level. Lifetime Warranty - We are so confident in the quality of our products that Sightron offers a Lifetime Warranty. ExacTrack - This scope features Sightron?s unique ExacTrack windage and elevation adjustment system. No other system on the market comes close to the precision and performance of ExacTrack. Zact-7 Revcoat Multi-Coating - Sightron?s Zact-7 Revcoat employs revolutionary lens coating technology featuring fully multi-coated precision ground glass. Waterproof - Rain snow or humidity Sightron optics are built using 100% sealed system ensuring a lifetime of performance in the most extreme environmental conditions. ED Glass - Extra Low Dispersion Glass is a special glass added to optical systems to prevent chromatic aberration. Shockproof - Rated for recoil and impact from even the toughest loads. Nitrogen Gas Charged - Nitrogen filled to provide a lifetime of use from fogging and internal water buildup.