It is a Laser light show thing similar to something you might see in the planetarium. It was manufactured in the mid 70's by The Original Infinity Speaker Company. The unit has RCA inputs and takes a tape out signal and presents a light show on the wall which changes to the music. I have been trying to purchase one here but have not had any luck yet. Almost every want ad on audiogon has been filled but this one seems a little tougher. Thanks!