... 4 ports usb 2.0 hub 1,4 ports 2,supports USB2.0/1.1, 3,No driver ... required,plug and play,support hot swapping; Item NO: MDTC-E004 4 ports usb 2.0 hub Feature Extend 4 USB ... ports,each supplies power 500mA (max.); USB 2.0 high speed transfer port, compatible USB ... your computer and device from damaging. Internal USB line LED will flash to indicate the operation ...