This power pack cable is an OEM CU-5 flash ring power supply cable, it goes from the power supply to the flash making it easy for you to power up your camera and start snapping photos. The cable is in very good cosmetic condition, but has not been tested. Please see photos for further details as the item pictured is the exact item you will receive. See my other listings for more CU-5 parts, cameras, and many other great items.