Turn your USB port into a gigabit ethernet port. Great for computers without a built in ethernet port. Works with both Mac and PC systems. Features: Adds a Gigabit Ethernet port to your computer. Supports USB 3.0 (5Gbps) and USB 2.0 (480 Mbps) Ethernet connection speeds at 10/100/1000Mbps. LAN Activity and Ethernet Speed LED indicator. USB bus-powered. Compact design for maximum portability. System requirements: USB 3.0 and USB 2.0 port; Mac OS X 10.7 or later; Windows 7 /8. Driver for Gigabit Ethernet required and available for download from the Macally website. Must Buy Reasons: Specially designed for MacBook Air and new MacBook Pro (Retina) without Ethernet port. Supports Windows PC Quickly adds one Gigabit Ethernet port into your computer. Gigabit Ethernet port is 3 times faster and more reliable than the fastest WiFi connection. 2-tone, stylish and anodized aluminum housing System Requirements: Mac OS X 10.7 to 10.10 and above. Windows XP/Vista/7/8 and above Any desktop and notebook computer with available USB 3.0 or 2.0 port.