Specifications:
1) Expands four USB port supply up to 550mA current per port
2) Uses a second generation controller
3) No external power supply necessary
4) Driverless, hot plug and play
5) Internal over current protection circuits
6) Support USB 1.0/1.1, USB2.0, full speed up to 12Mbps
7) OS Support: Windows 95/OSR2/98SE/Me/2000/XP, Linux 2.4 and Mac or over
8) Chains up to 127 drives