Olympus Remote sensor A310 flash unit. rare item

Unit type : Sensor for auto bounce flash photography.
Mounting to the camera : Accesory shoe slide-in type.
Electrical Connection to Camera: Cordless contact or via optional Synchro Cord 0.6 m.
Electrical Connection to Quick Auto 310 : Plug-in cord.
Operation modes ; Auto / manual setting.
Auto F. number Setting : Choice of 3 apertures (F4,F5.6 and F8 at 100 ASA.)
Sensor Acceptance Angle : approx 20º.
Bounce Flash : With optional Bounce grip.
Manual : Full power flash at HI (GN 34 at ASA 100 , or GN 55 at ASA 25.)
Film speed range : ASA 25—1600 ( 1/3 step settings by rotating dial )
Size and weight : 53x 46x 33mm. 70 grams.
This sensor was made tu use the Quick 310 flash unit on manual cameras . It provides the metering from top of the hot shoe.