USB 2.0 to Fast Ethernet Adapter (also known as a USB to Cat5 / USB to RJ-45 adapter) Converts a USB 2.0 port into an auto-sensing 10Base-T or 100Base-TX Fast Ethernet port Easy plug & play installation Backwards compatible with USB 1.1 and 1.0 host controllers Both full and half duplex modes supported Bus-powered from USB port Activity LED Compatible with ME/2000/XP/Vista/7/8, Mac OS X, Linux 2 year warranty This compact USB to RJ-45 adapter allows you to conveniently connect your desktop or notebook PC to a network via a USB port. There is no need to unscrew and open any cases or housings in order to install a network card... simply Plug and Play.