Startech USB 3. 0 to Gigabit Ethernet Adapter NIC 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 pass-through 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