Conceptronic 56Kbps USB Voice/Fax Modem, 56 Kbit/s, USB 1.1/2.0, 28.8/33.6/56 Kbps, ITU V.92, ITU V34-annex12, 14.4 Kbps, CE Conceptronic 56Kbps USB Voice/Fax Modem. Modem speed: 56 Kbit/s, Interface: USB 1.1/2.0. Supported data transfer rates: 28.8/33.6/56 Kbps, Data link protocols: ITU V.92, ITU V34-annex12, Maximum fax transfer rate: 14.4 Kbps. Compatibility: CE. Minimum system requirements: Pentium 233 MHz, Compatible operating systems: Windows 98/Me/2000/XP