56K External USB Fax Modem, Fully Complies with ITU V9.2/K56Flex 5,600bps Transmission Protocol Product description56K USB Modem, offers universal Plug-and ... (56Kbps), V.34 (33.6Kbps) protocol standardsFeaturesComply with external USB 56K Modem, supports hot plug and can be used by laptops and ...