The JUE136 USB 3.0 Gigabit Ethernet Adapter is a simple, one-piece external adapter that plugs into the USB port on your Ultrabook or MacBook. It is the ultimate solution if you do not have an Ethernet port or if you just want to increase your connection speed. The elegantly designed JUE136 uses an RJ-45 connector that supports 10/100/1000 Mbps Ethernet performance and allows you to add networking capabilities to a computer without them through a Wireless LAN connection.