Original Apple PowerBook internal 2400 baud Fax/Data Modem board which was originally supplied as an option for the PowerBook 140, 145, 145B and 170. Note that tis is the international version which presents as a 7-pin mini-DIN socket (the same as the serial and printer port) at the rear of the PowerBook rather than an rj11. It requires an external region-specific Apple Express Modem DAA (Data Access Arrangement) adapter to connect to a phone line.