Summary

It's a "cable" version for the USB-to-TTL CH340, more suitable to use it as a communications device.
I removed the connector of my CH340 and placed a SIO cable on it's place, to use it as a SIO2PC device for my Atari 800XL.
So I needed a case for that and found BogdanKecman case (https://www.thingiverse.com/thing:2527773/files) that needed some changes in order to fit to my project that I printed in black PLA.

Thanks, BogdanKecman!