TRENDnet 56K USB 2.0 Phone, Internet and Fax Modem, TFM-561U Supported OS: Windows 7 (32/64-bit), Vista (32/64-bit), XP (32-bit) and Linux Connects your laptop or desktop computer to the internet using a dial up Internet service Only one phone line requiredmaintains Internet connection while receiving telephone calls Powered by your computer's USB port Advanced telephone and fax functionality