CD-ROM2 and Interface Unit. Junk item. Non-functional. Requires repair for use. For parts, etc. Everything in the photos is included. Bonus 1: A replacement middle gear set made by a volunteer, obtained through an online auction. Bonus 2: Interface unit and CD-ROM unit circuit boards. Junk items. Several years ago, during the COVID-19 pandemic, I had free time and collected these, but I never got around to repairing them. The storage capacity in my closet has reached its limit, so I'm letting them go.