The ST4300USB3GB 4-Port Super Speed USB (Universal Serial Bus) 3.0 Hub means that you can add 4 additional USB (Universal Serial Bus) 3.0 ports from a single USB (Universal Serial Bus) 3.0 connection to the host computer system. Backward compatible with USB (Universal Serial Bus) 2.0 & USB (Universal Serial Bus) 1.x standards, this USB (Universal Serial Bus) 3.0 hub still supports older USB (Universal Serial Bus) devices & can also be used as a hub on older systems that do not have USB (Universal Serial Bus) 3.0 ports. With the capability to mix & match USB (Universal Serial Bus) 3.0/2.0/1.x devices & be used with or without the included external power adapter, this hub offers the best of versatility & portability.