Lenovo ThinkPad Ethernet Extension Cable Gen 2.

Product Description
ThinkPad Ethernet Extension Adapter Gen2 is the unique Ethernet cable for ThinkPad selected systems, enabling Ethernet connection and supporting PXE and Remote control features. With a small form factor and a cable length of 80 mm, it is convenient and portable. Driver-free, plug and use.
Enjoy a fast network connection with data transfer rate of up to 10Mbps, by connecting this Ethernet card to your PC
This single port ethernet card enables you to connect your computer system to your existing network
Supports cost-efficient twisted pair cables for speedy data transfer up to 100 meters