USB 2.0 to Fast Ethernet Adapter (also known as a USB (Universal Serial Bus) to Cat 5 / USB (Universal Serial Bus) to RJ-45 adapter) Converts a USB (Universal Serial Bus) 2.0 port into an auto-sensing 10 Base-T or 100 Base-TX Fast Ethernet port Easy plug & play installation Backwards compatible with USB (Universal Serial Bus) 1.1 & 1.0 host controllers Both full & half duplex modes supported Bus-powered from USB (Universal Serial Bus) port Activity LED Compatible with ME/2000/XP/ Vista/7/8, Mac OS X, Linux 2 year warranty This compact USB (Universal Serial Bus) to RJ-45 adapter means that you can conveniently connect your desktop or notebook PC to a network via a USB (Universal Serial Bus) port. There is no need to unscrew & open any cases or housings in order to install a network card... simply Plug & Play.