Edimax USB 2.0 to Fast Ethernet Adapter (EU-4208) Complies with IEEE 802.3/802.3u standards Supports Windows XP/Vista/7/8/8.1, Linux and Mac OS X 10.x Complies with USB 2.0/1.1 specifications Supports 10/100Mbps auto-negotiation Low power consumption in idle mode and low traffic conditions No external power adapter required Edimax EU-4208 is made for giving any computer without an Ethernet port. Simply plug this Fast Ethernet adapter into a USB 2.0 port of your ultrabook to gain Fast Ethernet connectivity within a minute. EU-4208 is also a quick and convenient way to add Ethernet connectivity to desktop PC without the hassle of opening up the computer case. It is backward compatible with USB 1.1 standard, and can function seamlessly with Microsoft Windows XP / Vista / 7 and Mac OS 10.x. In addition to its compact design, EU-4208 is also designed to use power efficiently to prevent unnecessary waste of power. It will lower its power supply for low power consumption in idle mode. Standards: Complies with IEEE 802.3 / 802.3u standards, Complies with USB 1.1 / 2.0 specifications. Ports: 1 x 10/100 Fast Ethernet RJ-45 Port , 1 x USB 2.0 Port ( USB 1.1 backward compatible ). Data Rates: Up to 100 Mbps Operating System: Microsoft Windows XP / Vista / 7, Mac OS X 10.x. Dimensions: 2.5" x 1" x 0.6". Temperature: 0-70C (32-158F). Humidity: 10~90% Non-Condensing