Calibrated for crossbows that shoot in the 330 FPSrange, this 20, 30, 40, and now 50-yard combo illuminateddot and crosshair configuration is housed in alightweight 8.5-inch aluminum tube equipped with fullycoated3x optics. The illuminated dots are positioned atthe intersection of each of the duplex crosshairs. Thenew fourth dot is free-standing and situated directly belowthe 40-yard crosshair. In the field, you select nonilluminatedblack dots or one of two illuminated, coloreddots (red or green) controlled by a five-position rheostatso you can match the illumination intensity to your huntingconditions.