The product is a vintage Microsoft MacEnhancer specifically designed for the Apple Macintosh Plus with serial number 502138. This item is a piece of nostalgia for vintage computing enthusiasts looking to enhance the external capabilities of their old Macintosh Plus system such as for printing and networking. Appears to be in very good cosmetic condition, some minor discoloration and surface wear, the item is untested. The ports and rubber feet are all good and there are no cracks in the plastic. One of the few if not the only hardware item Microsoft ever made for Apple computers!