DROK Buck Boost Converter, DC 5.0-30V to 0.6-30V 4A 35W Adjustable Voltage Regulator LCD Display 6V 9V 12V 24V Power Supply Module, CC CV Step Up Step Down Voltage Stabilizer for Car RV Golf Cart

It works, and can be set up for basic operation easily. It comes with a full-color instruction sheet.That said, the instructions are not easy to understand and the number of functions is mind-boggling. Just understanding what those functions are is challenging. But DROK did have the decency to set the startup defaults for the most likely use -- providing adjustable voltage at unrestricted amps.Keep the instruction sheet. Maybe even give it a once-over. But hope you never have to use it. I predict frustration.

Really useful item when you need it. No complaints. It takes a few minutes to understand the controls, but that's really all. It might have helped if I looked at the instructions. If you're looking at this converter, you already know what it does.

The module works as expected. Seems like a good addition to my old 24V 4A linear power supply,

Well, I just got this bad boy set up after pulling it out of the package and I can already tell the LCD screen won’t last very long. At first it displayed “Li.i0 CV and 0. backwards seven i0 A” and I couldn’t tell you what the last portion was. After about 20 minutes or so the LCD started to display a little bit clearer, but my confidence level in the screens lifespan isn’t great. I will say, it does appear to be functioning the way that it should (of course other than the display). I’m not saying this will be the experience for everybody, but the picture included shows the best it’s displayed so far. But it’s definitely a hit and miss on the quality when powering on. Edit: for some reason, my review won’t go through either. Either way I’ll be requesting a refund the following day the screen is getting worse.

I bought this item about 18 months ago and it worked great. After almost constant use as a DIY lab power supply, some of the segments in the LCD display quit working. Although you need at least five hands to disassemble the unit, I finally got it apart, removed the LCD display and cleaned the zebra connector and PCB connector with 99% IPA. I reassembled the unit, and it works flawlessly. Looking closely at the PCB design and overall assembly, this is a high quality product. If it ever dies, I will get another one from the same supplier.

Dosplay died re order

The LCD on both the original and replacement were DOA. Definitely a bummer as the rest of the unit appeared to be good quality and powered up properly

We only used its voltage regulation settings (I think it has a current limiting option.) The setting held firm and was accurate within 0.02 volts of our meter readings at 20 watts, running a DC motor.Manual adjustment of the voltage takes a LOT of spinning. Felt like turning that knob a full turn only adjusted it .1 volts ... at least it felt like that. :)