This is the most common type of synchronization cords. It is considered a standard and fits most of the cameras ever made, except for newer cameras that have complex electronic interaction between a camera and a flash. It also fits slave sensors. The male end goes into the camera, and the female one goes into the flash. This extension cord is very easy to use. Simply plug in the male end to the camera and the female to your Flash. This cord is 16.5 feet/ 5 meter long.