Hardware-based, external 56K USB dial-up and fax modem from StarTech, Data transfer rates up to max. 56 Kb/s (down) and 33.6 Kb/s (up) or 14.4 Kb/s (fax), Conexant CX93010-21Z chipset, RJ11 female, USB 1.1 connector (compatible with USB 2.0)