digital clock with USB 2.0 hub/ table clock clock usb 2.0 hub Plug and play installation Supports 12/480Mbps transfer ... with USB 2.0, 1.1 and 1.0;3.Individual Port Over-Current Protection;4.Suitable for Notebook, scanner,digital camera,imput ... device,audio system;5.Supports 12/480Mbps transfer mode;6.Four ports,one cable extra digital clock with USB 2.0 ...