4 port USB HUB,USB HUB,HUB,Mini USB HUB, 4 port USB HUB1.Compliant with USB (universal serial bus) Rev2.0 2.Support high-speed 480Mbps, full-speed 480Mbps, low speed 12Mbps 3.Protection for current overload 4.Fully compatible with all USB devices 5.Supports self-powered and bus-powered mode6.USB1.1 and USB2.0 optional 7.Power adapter optional 4 port USB HUB,USB HUB,HUB,Mini USB HUB,