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 cross-hairs and five dots calibrated for 20, 30, 40, 50 and 60 yards (fourth and fifth dots are free standing, just below the 40-yard cross-hair). 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.