This is a listing for a Yongnuo PC Coiled Connector Sync Cable Studio Flash Strobes. On one end it has a threaded male PC sync plug and on the other end is a ¼ mono plug sync cable. It also comes with a ⅛ (3.5mm) Adaptor. It is for use with a Yongnuo RF603 but can be used to adapt a camera 3.5mm port for use with an old school wired system. Thanks for looking. Message me with any questions.