U.S. Robotics USR5637, 56K USB Controller Dial-Up External Fax Modem w/VoiceCondition:* New Surplus Stock. Sealed OEM Packaging. As Pictured.Additional Notes:* Controller-based modem integrates powerful communications processing functions into the modem itself, for assured performance without sapping processing power.* Windows Server 2012 R2/Win 10 /Win 10 64 bit/Server 2012/Win 8/Server 2011/Win 7/Server 2008/Vista/Server 2003/XP/2000 Mac 10.4-10.12* Linux 2.4.20 Kernel or Higher (Unimodem TSP/TAPI Compliant)* Intel Pentium III 600 MHz or Equivalent, 128 MB RAM, 5 MB Hard Drive Space* Data: V.92, V.90, V.34, V.32bis, V.32, V.22bis, V.22, V.23, And V.21* Data Error Control/Compression: V.44/V.42/V42bis and MNP24/5* Fax: EIA578 (Class1) With V.17, V.29, V.27ter, Group3* V.80 Video Conferencing Support* DTE Interface: USB Version 2.0U.S. RoboticsUSR5637