Specification:

1) Expands four USB port supply up to 550mA current per port
2) 4 ports hub
3) Driverless, hot plug and play
4) Support USB 2.0 and USB1.1
5) OS Support: Windows 95 OSR2/98SE/Me/2000/XP, Linux 2.4 and Mac or over
6) Size:10.5*2*2 cm