The Edimax EU-4208 is a compact USB (Universal Serial Bus) Fast Ethernet adapter for an Ultrabook or Macbook Air with no Ethernet ports, or for desktop & notebooks that need an additional Fast Ethernet port. It’s an ideal portable accessory or replacement network adapter, & with full 10/100 Mbps Fast Ethernet USB (Universal Serial Bus) 2.0 performance, it’s faster than most wireless connections. Connect to a 10/100 Mbps network from a USB (Universal Serial Bus) enabled desktop or notebook, save costs & replace an old or broken internal network card, or use it as an additional network interface for high-speed peer-to-peer file sharing. No external power adapter is required & the green, energy-saving design minimizes power usage when the device is idle. Ideal for Ultrabooks Designed to give Fast Ethernet connectivity to your Ultrabook, Macbook Air or any computer without an Ethernet port. Simply plug the adapter into a USB (Universal Serial Bus) 2.0 port & instantly utilize a stable 10/100 Mbps Ethernet connection. The EU-4208 is also a quick & convenient way to add Ethernet connectivity to a desktop computer without the hassle of internal installation. It’s backward compatible with USB (Universal Serial Bus) 1.1 & works with Microsoft Windows 2000/XP/ Vista/7/8/8.1, Linux & Mac OS X 10.x. Complies with IEEE 802.3/802.3u standards Complies with USB (Universal Serial Bus) 2.0/1.1 specifications Supports 10/100 Mbps auto-negotiation Low power consumption in idle mode & low traffic conditions No external power adapter required Supports Windows 2000/XP/ Vista/7/8/8.1, Linux & Mac OS X 10.x