Kanex KTU20 Thunderbolt to Gigabit Ethernet Plus USB 3.0 Adapter Thunderbolt technology enables bi-direction data transfer to improve transfer rate without compromising the performance of your computer Supports both USB 3.0 and Gigabit Ethernet interfaces for greater expandability of your MacBook Air or MacBook Pro Supports daisy-chain of USB hubs for greater expandability. Upstream port- thunderbolt and thunderbolt 2. Downstream port- usb 3.0 and gigabit ethernet Simply connect an Ethernet cable to the Kanex Thunderbolt adapter, and then plug into the Thunderbolt port of your Mac or PC Kanex Thunderbolt adapters won the Macworld Best of Show 2014 award for its ability to help Mac and PC users increase their connectivity options and bridge the gap between old and new technologies