“Designed for use with 4-SEM and 8-SEM Oberheim synthesizers; will record your every move for later playback. In VG+ cosmetic condition as depicted and works great. IMPORTANT – you will need your own cassette recorder to hook up to this unit for it to work. The cassette recorder Oberheim provided was an inexpensive early-model but anything will do, you probably have it lying around the house or can procure it cheaply on EB.” Link