The Kanex USB 3 to Gigabit Ethernet Adapter adds a Gigabit Ethernet port to your MacBook Air, MacBook Pro with Retina display or any other USB 3 enabled computer. Ideal for hotel rooms or conference rooms with a wired internet connection, this small and compact adapter connects to a USB 3 port on your computer and provides an RJ-45 port for connection to the internet or local area network for sharing and accessing files at data transfer rates of up to 1 Gbps.