That's one of the program modules for the 2nd gen Maxxums. They had different modules that would let you 'program' your camera for sports, portraits, etc.
It was supposed to let the amateurs get pro results by letting the camera do the settings according to the type of shot you were taking. Nowadays it's just built in, twist the dial or push the button to let the camera decide what to do.
An a700 and couple of a580s, plus even more lenses.