 It was a CD player you could plug into your Walkman and plug into your car, the tape player in your car, in order to play the CD. Absolutely. Do you remember it? You mean the cassette, right? The cassette would slip into the cassette player with a cord that came off of the cassette, and that would plug into your Walkman CD player so you could play CDs through your cassette player in your car. Is that what you mean? Yes, and it never worked.