Specification: • Adds 4 USB 2.0 ports to your computer; Built-in surge protector safeguards your devices • Easy to set up, Plug & Play, Hot swappable • Bus Powered - does not require an AC adapter • Compatible with USB 2.0 and 1.1 specifications. System requirements • Mac OS X 10.6 & higher • Windows 98SE /ME /2000 /XP /Vista /7/8 • Linux 2.4 or above