Tek Republic TUH-3400 Aluminum USB 3.0 4 Port Hub with 3A Power Adapter SuperSpeed USB 3.0 data transfer rate up to 5 Gbps with backwards compatible with USB 2.0 and 1.1 5V 3A Power Adapter for power hungry USB devices. Hub is not standalone charger Aluminum alloy casing Plug-n-Play & Hot-Swap Compatible with Windows XP, Vista,7/8 and Mac OS X v10.3.9 or later