Prontor-Compur

PC-socket, greatly magnified
General specifications
Hot pluggable Yes
Audio signal None
Video signal None
Pins 2

A Prontor-Compur connection (also known as a PC connector, PC terminal, or PC socket) is a standard 3.5 mm (18 in) electrical connector (as defined in ISO 519) used in photography to synchronize the shutter to the flash.