Detailed Product Description 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