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Description:1.4 ports usb hub.2.Dire city connected to the computer without an extered power supply, simply and easy to use.3.USB 2.0 interface, support usb 1.0/1.1/2.0 transmission speed 1.5/1.2/480mbps.4.Builtin overload short-circuit protection devices.***** USB port extended to four , small, practical convenient, each supply up to 500MA.7.System support:win95/98/me/2000xp.8.Unique shape design. 4 ports usb hub, usb 2.0, usb hub