Usb hub 1)usb hub with 4 ports 2)usb 2.0 interface 3)supports data transfer rate of 1.5/12/480mbps 4)hot-swap capability and plug-and-play function 5)supports up to 127 usb devices 6)extensively compatible with scanner, digital camera, digital vidicon, audio-system, display, u-disk, and related input equipment Blister