The ST4300USB3EU 4-Port SuperSpeed USB 3. 0 Hub allows you to add 4 additional USB 3. 0 ports from a single USB 3. 0 connection to the host computer system. Backward compatible with USB 2. 0 and USB 1. x standards, this USB 3. 0 hub still supports older USB devices and can also be used as a hub on older systems that do not have USB 3. 0 ports. With the capability to mix and match USB 3. 0/2. 0/1. x devices and be used with or without the included external power adapter, this hub offers the best of versatility and portability. Backed by a StarTech. com 2-year warranty and free lifetime technical support.