iogear GUC3100 interface cards/adapter

USB 3.0 Gigabit Ethernet Adapter over USB
The USB 3.0 GigaLinq Ethernet Adapter plugs into your MacBook Air, Ultrabook, Microsoft Surface or other laptop's USB 3.0 port and allows you to connect a standard RJ-45 Ethernet cable to deliver Internet and network access at up to Gigabit (1000Mbps) speed. Simply install the driver, plug the GigaLinq into a USB 3.0 port, connect the Ethernet cable from your network router or hub and you're done. Now you can access the Internet or anything else on your network at blazing fast speed.

Portable Ethernet Network Access
The GigaLinq is super compact and easily fits into any computer bag, briefcase or backpack for use on-the-go. Now your hotel's lack of Wi-Fi no longer means lack of Internet access. For corporate or office environments that require a hardwired Ethernet connection, the GigaLinq provides a fast and easy way to connect your computer to any 10/100/1000BASE-T network.