Specification: Features 1.4 USB port A Type up 400mA and automatic current sharing by devices request 2.1 USB B Female connector 3.Over current protection 4.Support both full-speed 12Mb/sec and low-speed 1.5Mb/sec transfer rates Chains up to 127 USB devices 5.Truly plug & play automatic system configuration 6.windows 98,2000 device drives automatic installation 7.USB and ACPI compliant 8.4 port in 4 side