Showing a second gigabit ethernet added to Lenovo M600 in the spare interface slot. The card replaces the one in the M.2 slot for the wifi, and has a little cable running
Amazon.com: Lenovo M600 Tiny Dual Displays supported Computer (Intel Pentium up to 2.64GHz, 4G DDR RAM, 128GB SSD, WiFi, Bluetooth, HDMI, USB 3.0, Dual DisplayPort, Windows 10 pro) (Renewed) : Electronics