The JUH470 Usb 3.0 Gigabit Ethernet and 3-Port Hub provides extra connectivity from your computer with 5 Gbps transfer speed. These pocket-sized multi-adapters allow you to add additional Usb peripherals and a Gigabit Lan through your Usb port. With this Gigabit Hub adapter, you can add networking capabilities to a computer without them through a Wireless Lan connection. It has an Rj-45 connector that supports 10/100/1000 Mbps Ethernet performance and is perfect for your Ultrabook or MacBook.