StarTech.com Retractable Patch Cable - phone/network cable - 8 ft

This retractable CAT 5e RJ11/RJ45 Cable is an ideal laptop accessory for mobile professionals. It allows you to connect your notebook computer to a wall outlet, router, hub, or any other network-enabled device, and provides simple access to high-speed networks or the Internet while you are traveling. Based on a convenient retractable design, the RJ45RET8 CAT 5e RJ11/RJ45 Cable ensures maximum convenience by eliminating cable tangles and clutter.

Plus, if you don't have access to a network connection, the RJ45RET8 doubles as a modem cable to provide a dial up connection that can be used for Internet access, sending/receiving faxes etc.