The Olympus Pen EES-2 (circa 1968) was part of the Olympus half frame (pen) electric eye (EE) series, it's an automatic exposure camera with a selenium meter around the lens. Although manual aperture settings are available for flash you can use them for manual exposure as the camera sets the shutter speed to 1/40 sec when not set on 'auto'. The camera is zone focusing having four positions marked with symbols from close up (head and shoulders) to infinity (mountain). In 'auto' mode when there's not enough light for proper exposure a red warning mark shows in the viewfinder and the shutter release is locked.
This model has a hot shoe unlike the EES which has no shoe at all.

Fun with this camera.
Aperture was stuck had to remove lens front element and shutter/aperture mechanism to clean blades. When reassembling the lens has to be screwed in the same amount as before or the focus will be off. Lots of fun getting the focus right again!!

Camera Specs.
Lens: 30 mm f2.8.
Shutter: Automatically set 1/40 or 1/200 sec.
Exposure meter: EE mechanism: (EE meaning Electronic Eye exposure meter) Program shutter exposure only.
Film speed index: ASA 25 - 400.
Viewfinder: Bright frame viewfinder with parallax correction marks.
Flash Synchronization: Hot shoe and PC socket.
Self timer: None.
Film Loading: Standard muti-slotted take-up spool.
Film Winding: Thumb wheel winder at back of of camera top.
Size: W 108 mm x H 66 mm x D 48 mm.
Weight: 370 grams.