It is a connection cord that allows automatic shutter release
at the moment of sharp focus.
This cord is for use with the OLYMPUS
OM-30 and OLYMPUS
Winder I or II.
It plugs into the "Focus Trigger" socket on the
camera and "Shutter Release" socket on the winder.
This cord can be used with or without an OLYMPUS Auto
Focus lens fitted to the camera.