I have several of these, including a cute little plastic model that uses 100 speed film. No way to change any settings, so I am assuming it is about 100-125 in speed and f11 or f16 in aperture. Used HP5+ with it , as I shoot that film between 160 and 250 ISO, depending on which camera I am using. The negatives look ok, would hate to see what I would have if I had been using ISO 100.
I just got a higher end model that features a DX system, and is a little more envolved. Haven't developed any negatives from this one.

they are fun to play with.