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4-port USB HubThe Belkin F5U021vSN USB 1.1 hub features one USB upstream port to connect the hub and your computer and four USB 1.1 downstream ports for connection to a variety of USB devices like mice and keyboard, scanners, printers and external optical drivers.
Power Adapter IncludedThe Belkin F5U021vSN USB 1.1 hub can be powered either via the USB port on your computer or via the external power adapter (included). When the bus power (through the USB port on the computer) fails to meet the power requirements of the USB devices, plugging the power adapter to external power will ensure your USB devices work properly.