... port andf data transfer rate up to 480Mbps4 Extensively compatible with scanner, digital camera, digital vidicon, optical mouse, keyboard, ... power supply required7.Single chip integrated USB HUB controller with embedded proprietary processor8.Support windows 98/me/2000/xpista, ... - 85Coperating current500MAworking voltage5VOperating humidity10% - 90% 4 port usb hub with high quality and low price