1.4 ports usb HUB 2.Fully compliant with USB 2.0 specifications backwardly 3.Compatible with USB 1.1 4.Plug&Play installation 5.Add 4 USB 2.0 Full-speed or Low-SPeed devices 6.Over-friendly and ergonomic design 7.Support OS:Windows 98/98se/2000/me/xp,Mac 8.6 or Higher version