... carry 3,Plug and play, hot swapping 4.CE&ROHS 5,professional manufactures USB HUB ,4 port USB HUB Feature: 1) USB2.0 ... HUB with 4 port2) Support data transfer rate 1 ... USB devices4) Extensively compatible with scanner, digital camera, digital vidicon, Optical mouse, keyboard, U disk etc.5) Single chip integrated USB ...