Combo USB 3.0 3 Port hub and 10/100/1000 Mbps Ethernet adapter.Add 3 extra USB 3.0 port and Gigabit Ethernet network connectivity to your Mac Book Air, Ultra book, or any PC with a built in USB 3.0 PortPortable and slim design, ideal for Ultrabook, Mac Book air, Tablet PC and PC. Bus-Powered : Draw power directly from computer. No additional power adapter neededUSB 3.0 Hub :Transfers your data at up to 5GbpsBackwards compatible with USB 2.0 Installs easily with Plug-and-Play convenienceEthernet Adapter :Supports USB 3.0, downward compatible with USB 2.0, and 1.1Transfer speed up to 1000MbpsDriver free installation for Windows XP, Vista, 7, 8 and 8.1, Linux and Mac OSVery low power consumption, compliant with IEEE 802.3az Energy Efficient EthernetSupport Windows 8 AOAC and Intel LPM/LTMSupports CDC-ECMChipset : RTL 8153Microsoft NDIS5, NDIS6 Checksum Offload (IPv4, IPv6, TCP, UDP) and Segmentation Task-offload (Large send v1 and Large send v2) supportSupports jumbo frame to 9K bytesFull Duplex flow control (IEEE 802.3x)Fully compliant with IEEE 802.3 and IEEE 802.3u1 X USB 3.0 Hub / Giga Lan combo Adapter1 x USB 3.0 Cable Check out my other items!