Dual Port built in buzzer, Compatible with Windows 10, latest windows OS – Driverless installation for Windows 10 8.1 8 7 32 – Bit and 64 – Bit; Tested on Dell Inspiron 3847, Windows 10 home 64 bit – Send/Receive Fax successfully – Dial up connection connected to NetZero at 46.6 Kbps; USB 2.0 plug and play - Fast & easy hardware and driver installation – USB powered, no power adapter needed; Dual RJ-45 11 phone jack for expansion – Dual Jack for connecting an additional telephone or answering machine; Fax Compatibility ITU – T – Send and receive rates up to 14.4 K bps, MOH – Receive Phone Call During Active Internet Connection