The bullet drop compensating and ranging reticles allow for the shooter to quickly and accurately estimate range and apply the correct hold. The first focal plane reticle allows the subtensions and drops to remain true at any magnification. Robust enough for any application, the VCOG utilizes a single AA battery and offers 6 adjustable brightness settings for the LED reticle. When powered by a lithium AA battery (provided), it boasts a considerable battery life of 700 hours at setting 4 (constant on). An integrated dial fin allows easy rotation through the magnification range and a constant eye relief means no head or stock position adjustments are needed. Waterproof to 20 meters. 1-6x24mm Riflescope with Segmented Circle Crosshair .308 175 Grain Ballistic Reticle and TA51 Thumb Screw Mount.