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