Use genius MP1584 IC, aiming for more professional and long term comercial project. (many other mp1584 module may not genuine IC)
All the rest periphferial parts are also high quality.
Fixed output either 3.3V from 6.5-28V input
Input from right side, and output on right, please see back side pin definition.
Adjustable version (the breakout board use potentiometer or multi-turn trimmer pots) is bad for long term use, due to external temperature, vibration, etc.
Can be embedded as SMT or DIP part.
Work frequency 1.5Mhz, output current 2.5A can work for long term