Use with Any Apple II, III, Lisa (Mac XL), or Macintosh up to the Beige G3 with the appropriate data (serial) cable.
Apple Personal Modem, A9M0334. Also on label is the part number P/N 825-1412-B. This little modem is designed to plug directly into a wall outlet. The Apple Personal Modem can run at baud rates of 300 or 1200 bits per second. Modem flashes the light and beeps when plugged in, signaling that the circuitry is operating properly and receiving power.
This Personal Modem looks good, but there is some uniform discoloration. Tested to power on only as I don’t have a telephone service capable of dial-up.