Item: USB2.0 HUBSpecifications:    1) Expands four USB port supply up to 550mA current perport 2) Uses a second generation controller   3) No external power supply necessary  4) Driverless, hot plug and play   5) Internal over current protection circuits6) Support USB 1.0/1.1, USB2.0, full speed up to 480Mbps 7) OS Support: Windows 95 OSR2/98SE/Me/2000/XP, Linux 2.4 and Mac or over 8)Chains up to 127 drives

computer USB 2.0 HUB 4 port