It's a set-up I used for taking 3D photographs. Stick two cameras on a handle with their lenses the same distance apart as your eyes, press the buttons together and you get a 3D picture. It's better than the take-photo-move-take-photo approach (which uses just one camera) because it can capture things that are moving.
I've either taken 6 pictures with it so far or there are 7 left to take, depending on what the number in the window indicates. I guess I'd better use them soon. The expiry date for the film is 2004, so I need to be quick about it.