Add a 10100mbps ethernet port to your laptop or desktop computer through usb the usb2100 usb 20 to 10100 mbps network adapter lets you add a fast ethernet port to your laptop or desktop computer through usb this compact usb network adapter offers a dongle design with a built in cable to avoid cramped connections making it a perfect solution for adding wired ethernet connectivity to your desktop without opening the case or to replace a failed onboard network adapter on your laptop syste