Does what it's supposed to, except when supplying it with a 5 volt source it was reading about 6.4 volts and I couldn't adjust it any lower. When supplied with a 12 volt source it was more accurate with displaying the input voltage at 11.9 to 12 volts, and the output voltage was displaying the same input voltage. To change what is currently being displayed when running power through it I held down the right button for a second or two then released, whatever was being displayed would start flashing, and I could adjust the reading by pushing and releasing the buttons until the correct voltage or current was displayed. The left button decreases the value and the right button increases the value, after being satisfied that the display matched the actual input and output values I held down the left button for a second or two to return the display to normal. When not in the adjustment mode, the left button turns the display on/off, the right button cycles through the input/output voltage/current values and there's another setting that will cycle through all the values automatically. Current and voltage output adjustments are accurate too. Overall still satisfied with the product, just need to find a use for it. Hope this helps. Used a multimeter to measure.

It's works wonderfully like it should. The quality of everything seems wonderful. My only problems with this were the absolute lack of any instructions or manual. I had to rely on looking at the photos to know how this functioned (and I'm still not 100% sure how to work this thing) and for figuring out how to assemble the shell.

I really like this little device. Easy to use, accurate and priced right

I haven't unpacked it yet, but it looks like everything's here. Have some other issues to take care of before I take this out of the package and assemble it, but I'm sure it will be fine.

It's a nice dc to dc convertor. Only problem I don't like about them is the screws to tighten the wire lugs. Nothing really fits it well, phillips, flat or even a small torx screwdriver and I have all those nice tools for small work. Other than this it's a nice unit for that price range.