Complies with IEEE 802.3/802.3u standardsSupports Windows 2000/XP/Vista/7/8/8.1, Linux and Mac OS X 10.xComplies with USB 2.0/1.1 specificationsSupports 10/100Mbps auto-negotiationLow power consumption in idle mode and low traffic conditionsNo external power adapter requiredEdimax 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 / 2000 / 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 MbpsOperating System: Microsoft Windows XP / 2000 / Vista / 7, Mac OS X 10.x. Dimensions: 2.5" x 1" x 0.6". Temperature: 0°-70°C (32-158°F). Humidity: 10~90% Non-Condensing