IO GEAR GUH274 4 Port USB 2.0 HUB (No Power Adapter Included) IOGEAR's 4-Port USB 2.0 Hub provides 4 Hi-Speed USB 2.0 ports for your high-speed connectivity needs. This device is USB 2.0 certified and provides a data transfer rate of up to 480 Mbps (high speed). It supports Windows 98SE, 2000, ME, XP, Vista, Windows 7, Windows 8/8.1 and Mac OS X or later. The MicroHub? 2.0 also supports USB 1.1 devices since it is backward compatible with USB 1.1 specifications. It is very easy to use, Plug-n-Play, hot swappable and portable. It is backed by IOGEAR's 3 Year Limited Warranty. Condition: Used Includes: Unit only (No power adapter included) FEATURES : 4 USB 2.0 ports for easy expansion Built-in USB cable for immediate connection Tuck-away cable design eliminates cable clutter Supports a data transfer rate of up to 480Mbps 40 Times faster than USB 1.1 products Guarantees 12Mbps bandwidth to each port for USB 1.1 devices Plug-n-Play, hot swappable Backward compatible with USB 1.1 specifications Supports Windows 98SE, 2000, ME, XP, Vista, 7, 8, 8.1 and Mac OS X or later version LEDs allow for easy status monitoring