The Firefield® Tactical 4-16x42AO Riflescope is the ideal scope for the multi-purpose shooter. This scope offers the choice of a red or green illuminated Mil-Dot reticle and 1/4-inch click MOA adjustment, making it ideal for tactical shooting and rangefinding. Shooters can also use the Mil-Dot reticle as a hold over for bullet drop compensation or windage correction. Battery life for the adjustable illumination is between 80-150 hours. The objective lens has parallax adjustment, adjustable from 15 yards to infinity giving the shooter the ability to accurately engage targets from any range. This presents a great advantage for competition shooters and high-powered Air guns. This riflescope is water resistant and fog proof with operating temperatures between -20 degrees and 60 degrees Celsius, making it a versatile tool for any Environment. It easy-grip, open windage and elevation turrets on the top and side of the scope allow the shooter to quickly fine-tune the reticle for greater accuracy. Weighing only 26 ounces, this lightweight but sturdy riflescope can handle up to 1200g™s of recoil.