This 8.25-inch aluminum scope features a variable speed and arrow drop-compensation setting for crossbows that shoot between 275 and 425 FPS, and requires no adjustment for distance. Three duplex crosshairs and five dots calibrated for 20, 30, 40, 50 and 60 yards (fourth and fifth dots are free standing, just below the 40-yard crosshair). Has non-illuminated black dots and can be turned on for either red or green rheostat-controlled, illuminated colored dots with 5 light intensities each. An etched glass reticle and fully multi-coated 1.5 to 5x optics reduce the loss of light transmission, while a 30mm tube heightens light-gathering and durability.