This Sync cord is a 16' (5 m) 2.5mm Sub Mini Plug to Male PC Sync Cord. A PC
(Post Connection) Cord connects a camera to a flash head, or monolight, enabling
the flash to fire at the instant the shutter button is pressed. Many cameras do
not have a PC terminal to connect this cord. If so, an additional Hot Shoe
Adapter must be used, to provide the necessary terminal.