Take advantage of the speed and power of modern crossbows with a powerful optic. OPTI SPEED features a drop-compensating reticle to provide accurate hold-overs from 20-70 yards and calibrates to any speed of crossbow by scaling the reticle with a simple dial. The glass-etched reticle can be used with or without illumination, depending on surrounding light and target color.A quality crossbow deserves a quality optic. It is time to ditch the "combo package" scope, and opt for a quality scope that delivers a bright picture and pinpoint accuracy in the field. Empower your crossbow with the OPTI SPEED, only by TRUGLO. Glass-etched reticle can be used with or without illumination Enhanced crossbow BDC reticle compensates for bolt drop and provides accurate hold-over points from 20-70 yds Speed-calibrated magnification system scales the reticle and target image to match bolt velocity (215-450 feet per second) Waterproof / fog-proof / nitrogen gas-filled Fully-coated lenses provide maximum brightness, clarity, and contrast Adjustable rheostat brightness control Durable leaf-spring click adjustments for windage and elevation Wide field of view 1/2-MOA windage/elevation adjustments Weaver-style 30mm rings included Battery included (TG988C, 3V CR2032)