read card, USB hub, mini USB HUB,2.0 USB HUB,1.1 USB HUB ,4 PORT USB HUB read card, USB hub, mini USB HUB,2.0 USB HUB,1.1 USB HUB ,4 PORT USB HUB3)Full plug-and-play capability 4)Hot-swapping capability 7)Compatibility: Windows 98 SE or above and Mac OS 8.6 or above DIMENTION :23x23x100MM N.W:7KGS G.W:8KGS QTY:100PCS/CTN MEAS:44x42x28CM