1)Expands four USB port supply up to 550mA current per port
2)Uses a second generation controller

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 480Mbps
7)OS Support:Windows 95 OSR2/98SE/Me/2000/XP/Vista/7, Linux2.4 and Mac or over
8)Chains up to 127 drives