Songhe MP1584 MP1584EN DC-DC 3A Adjustable Buck Converter Voltage Power Step Down Module 24V to 12V 9V 5V 3V for Arduino Raspberry Pi (10pcs)

I've tested out 3 of 5 of them so far.1 worked beautifully1 was covered with some white dust and did not work at all. .16V out no matter the setting1 worked for a bit, then it had an internal short that popped it.

Easy to use, small and they work perfect