Extend 4 USB ports USB 2.0 high speed transfer port, compatible USB 1.1 downwards No driver required,plug and play,support hot swapping USB 2.0 device supports 480Mbps (max.);USB 1.1 device supports 12Mbps (max.) Built-in overcurrent short circuit protection setting, protect your computer and device from damaging Our factory accept OEM/ODM order,many of professional engineers to work for you .Just tell us your requiements we can provide the properest goods to you. Please feel free to contact with us.