The USB31000SPTW USB 3.0 to Gigabit Ethernet Adapter lets you add a Gigabit network port to your Macbook® or Ultrabook™ computer through a USB 3.0 port, and features an integrated USB 3.0 passthrough port that keeps your USB port available for use with other peripherals. The RJ45 port supports 10/100/1000 Mbps Ethernet and is fully compatible with IEEE 802.3i/u/ab standards. An ideal replacement LAN adapter or laptop accessory, this compact USB 3.0 NIC leverages the 5 Gbps speed of USB 3.0 to provide full gigabit bandwidth and also offers backward compatibility with USB 2.0 systems (speed limited by USB bus). The adapter supports features such as IPv4/IPv6 packet Checksum Offload Engine (COE) and TCP large send offload to reduce the load on your CPU. Jumbo Frames, full-duplex operation with 802.3x flow control and VLAN tagging are also supported, making this an efficient and full-featured USB network adapter. Backed by a StarTech.com 2-year warranty and free lifetime technical support. More from the Manufacturer

• Gigabit Ethernet Adapter guarantees a replacement networking interface to client, server or workstation
• Provides a cost-effective solution by converting a USB port into an RJ-45 Ethernet port
• This single port gigabit ethernet adapter enables you to connect your computer system to your existing network
• Supports cost-efficient twisted pair cables for speedy data transfer up to 100 meters
• With the 10/100/1000Base-T technology get up to 1000Mbps data transfer rate over the twisted pair cable