Wow, does that bring back memories???!!! I had one of those contraptions too. Had a cardboard slide strip that encased the thin strip of film that contained the grainy
b&w photos. The projector had a push button to advance to the next frame. There was a 7" record (that might have played at 33&1/3 rpm) that came with each film strip program. I distinctly remember a rather drab voiced/monotone announcer on the beginning of each record saying, "Push the button when you hear this beep", and a beep would sound.
I guess it was later that Kenner came out with the "Give-A-Show Projector", I had one of those too.
I guess I was 9 or 10 when my father finally caved and gave me access to his Revere 88 regular 8mm projector. It was around that time I also became an "Audio Visual Aid" in school and every morning would deliver various type projectors to the classrooms they were reserved for each day. Throughout the day I was also called upon to assist teachers who found threading 16mm projectors just too complicated. Good way to miss a few minutes of class here and there.