Original Apple PowerBook internal 2400 baud Fax/Data Modem board which was originally supplied as an option for the PowerBook 140, 145, 145B and fitted as standard in the US on the PowerBook170. Note that this is the US domestic version which presents as an rj11 and does NOT require an external region-specific Apple Express Modem DAA (Data Access Arrangement) adapter to connect to a phone line. Although not offered by Apple for later PowerBooks, Apple's documentation indicates that this model will work on the PowerBook 160, 165, 165c, 180 and 180c.