... ,new usb hub,multifunction mouse pad,promotion gift Fully compliant with the USB V1.1(Or USB V2.0) Single chip ... integrated USB Hub control with embedded proprietary processor. Supports 4 bus-powered/self-powered downstream ... . Runs at 12MHz frequency. Driverless,hot plug & play,Dual Blue LED show. Support OS:Windows XP,2000,ME,98,Vista ...