Need a hub" Don't have an ethernet connection" No problem! Combines the versatility of our U3HUBA and the convenience of our U3GBA in a single device. 3 USB 3.0 hubs that are compatible with USB 2.0 and 1.1 and an ethernet port for broadband connections. Comes with an external A/C adapter for devices that require more power. Features: Adds 3 USB 3.0 ports and a Gigabit Ethernet port to your computer Supports both USB 3.0 and USB 2.0 Ethernet connection speed at 10/100/1000Mbps Super fast speed USB bus-powered (no AC adapter required) Compact design and bulit-in-cable for maximum portability Hot swappable and plug-n-play Must Buy Reasons: Specially designed for MacBook Air and new MacBook Pro (Retina) without Ethernet port Works with Windows PC Quickly adds 3 USB3.0 ports and one Gigabit Ethernet port into your computer Supports all USB devices including USB drive printer webcam keyboard and mouse etc Gigabit Ethernet port is 3 times faster and more reliable than the fastest WiFi connection Backward compatible with USB2.0 computers and devices Just works without AC adaptor needed 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