Conexant RD02-D400 External 56K USB Modem for Dell  NW147,  Black Modem/Fax Data Rate: 56Kbps Data ITU-T V.92/ V.90 Product Type: Data/Fax Modem Form Factor: External Interfaces/Ports: 1 x RJ-11 Phone Line Windows 2000/XP/Vista, Mac 10.4 or later and Linux 2.4.20