Review on 💻 HiLetgo 5pcs USB to Serial USB to TTL CH340 Module: STC Microcontroller Download Adapter Bundle by Matthew Sytniak

They are nicely packaged in an insulating, see-through case and work great with a 3.3V TTL CPU (STM32F103RC). I didn't see any jumpers to select 3.3V or 5V because the board is so compact I doubt there will be room for it! I especially like the RED LED which doesn't blind your eyes when you plug in the module! Some other brands use blue LEDs which I feel are tailor made to fully illuminate a typical computer room :) But this one is discreet. I'm a lucky tourist!