The Apple Thunderbolt to Gigabit Ethernet Adapter lets you easily connect to a high-performance Gigabit Ethernet network. Small and compact, it connects to the Thunderbolt port on your Mac computer and provides an RJ-45 port that supports 10/100/1000BASE-T networks.
What's in the Box : Apple Thunderbolt to Gigabit Ethernet Adapter with built-in Thunderbolt cable
