Apple MB442Z/A USB Ethernet adapter for MacBook Air

The Apple USB Ethernet Adapter is a simple, one-piece external adapter that plugs into the USB 2.0 port of your MacBook Air to provide 10/100BASE-T performance. Simply plug your Ethernet cable into the RJ-45 connector - no external power is required. It's small, light, easy to install, and even easier to use. Box Contents: Apple USB Ethernet Adapter with built-in USB cable, User's Guide 10/100BASE-T (RJ-45 connector) 4.6-inch USB cable USB 2.0 with Bus power