This Cable Swich is designed for some of the MZ / ZX series film SLR's.
It consists of a 2-stage trigger. Stage 1 engages autofocus. Stage 2 fires the shutter.
A mechanical slider locks the shutter button down, for use with Bulb mode.
It has a 1 metre / 3.5' cable.
A slot is included which holds the plastic cover from the camera's port.