1.USB 4-port hub:1.1/2.0 version 2.Full plug-and-play capbility 3. Hot-swapping capability 4.The end of the three USB interfaces are freely rotate 300-degree angle,easily connecting to various USB equipment. 5.DC power:5V 500mA (DC adapter not included) and over-current protection function 6.Compatibility:Windows98 SE or above and Mac OS 8.6 or above