The H600P Extension Head for AD600Pro Flash Head from Godox is a great way to maximize the versatility of your flash system. After removing the flash tube from the AD600Pro and attaching it to the Extension Head, it plugs into the AD600Pro's flash tube socket and draws 600Ws of power from it. One benefit of this arrangement is the substantially lighter weight of the Extension Head that allows it to be hung or boomed overhead, allowing you to keep the weight of the AD600Pro lower on the stand, making the whole setup more stable. Weight: 3.3 lbs. *Does NOT include the bulb or a carry bag.