eBay
Here we have a Hayes Micromodem II, ca. 1983 - an internal modem for the Apple IIe. It was used to connect the Apple II to bulletin boards and other online services at 110 or 300 baud (bps).

Included in this auction are:
  • Hayes Micromodem card
  • cable and backplane for Apple II
  • Hayes Smartcom I software on 5.25'' floppy
  • Hayes Micromodem IIe and Smartcom owner's manual