EAS USB2.0 External 56K V.92 Dial Up USB Data/Fax Modem with RJ11 Cable for Windows 7/8 & Mac OS 10.9 to 10.10 Turn a PC into a fax machine, capable of sending and receiving faxes (Application Software Not Included.);Powered by USB Port, full speed (12MHz) USB interface, compatible with USB 2.0. Hardware Based USB Fax Modem - It is Plug and Play for Windows xp / 7 / 8.x,MacOS 10.9 to MacOS10.10.(Not for macOS 10.12-10.13,Not suggest Windows 10 users.) Compatible with V.92, V.90, and V.34 data modes;Compatible with T.31, V.17, V.29, V.27,and V.21 Fax modes. Data transfer rates up to 56Kbps (down) and 33.6Kbps (up);Fax transfer rates at 14.4Kbps Not supported in Mac OS10.12 macos Sierra or 10.13 High Sierra although there is stil a way to fax from Sierra and High Sierra with a modem.