USB to TTL Adapter is used to communicate with the IR Contoller via 4P connecting cable. In side the box you will get a USB to TTL Adapter based on Prolific MXT2303HX chipset.
Once you have installed the correct drivers for the USB to TTL Adapter, it should look like above in the Device Manager.
Note: Windows 10 needs driver version 220.127.116.11. Newer versions (other than download link) has a problem