... usb hub 2.Slim size,easy for carry 3,Plug and play, hot swapping 4.CE&ROHS 5,professional manufactures USB HUB ,4 port USB ... transfer rate 1.5/12/480Mbps3) Supports up to 127 USB devices4) Extensively compatible with scanner, digital camera, digital vidicon, ... Optical mouse, keyboard, U disk etc.5) Single chip integrated USB HUB controller with embedded proprietary processor6) 4 ports, and power ...