This power connector cable is our product PB820/PB960 power pack’s accessory. This item is the PB820/PB960 power pack flash cable for Metz.
Some flashes require that you install AA batteries into the battery compartment for powering the computer circuits, if AA batteries are required, PB820 nevertheless provide most of the power required for the flash, when using dedicated modules it may be necessary to power them by inserting AA batteries into your flash.