A cable sync system, it came out during the '60s and was comprised of an 18fps camera, sync cassette recorder, and projector. So far, I've collected the camera and recorder, and keeping an eye peeled for a set of instructions and a matching projector. Not really sure I need the projector, as there might be another way to resolve the pic and sound, just don't know what it is yet. Anybody had any experience with this system?