4.75-23V to 1-17V Mini 360 DC-DC Buck Converter Step Down Module

This is powerful and drives my shaver perfectly!

the thing did just what I needed

Had 3 go out on me and fried all the electronics, cost me about the 100 bucks in replacement parts. Do not buy.

The media could not be loaded.  10 of 10 did not work at all. I even bought some from a different site and none of them adjust either.The screw adjustment doesn't do anything. I have used hundreds of converters with all types of potentiometers but these do nothing. With 8v in they give 7v out. If you raise the input the output raises accordingly. The only thing these could be used for is if you needed a 1v step down that DOES NOT maintain a set output. lol. I even got some from Aliexpress and eBay but they are all the same way. I cant figure out why they even make them!? lol.Buy ones with the blue potentiometer and just be gentle.