Rosewill RHB-220 4-Port USB 2.0 Hub: * OS X support: Windows 98SE/Me/2000/XP/Vista/7, Linux, MAC OS 8.6 or above * Backward compatible with USB 1.1 * For bus-powered mode, the USB provide 500mA for all downstream and hub * Plug the A-type connector into the PC host port * Connect USB devices to the Hub downstream 1-4