Macally USB 3.0 to Gigabit Ethernet Adapter for MacBook Air/New MacBook Pro (U3GB) Specially designed for MacBook Air, new MacBook Pro computers without Ethernet Port Quickly add a Gigabit Ethernet port to your USB 3.0 enabled systems Backward compatible with USB 2.0 system Connection speeds at 10/100/1000Mbps Supports both Mac and PC Mac OS X 10.7 and above Windows XP/Vista/7/8 and above