US Robotics 56K V.92 USB Faxmodem. Modem speed: 56 Kbit/s, Interface: USB. Maximum fax transfer rate: 33.6 Kbps. Data link protocols: V .92, V .90, V .34, V .32bis, V .32, V .22bis, V .22, V .23, V .21. Minimum system requirements: 20 Mb HDD, CD-ROM, Minimum processor: Pentium III 500 MHz, Minimum RAM: 128 MB. Certification: FCC Part 15 Class B/Part 68, ICE -003/CS-03, UL/CUL