The item in the image is a Cable Matters SuperSpeed USB 3.0 to RJ45 Gigabit Ethernet Network Adapter (model number 202013-BLK). This device allows you to add a Gigabit Ethernet port to your computer through a USB 3.0 port, providing faster and more stable network connections than typical Wi-Fi.

I have 6 of them. 20.00 is for 1 of them