Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: I have tested this unit and with 13.71 volts DC input I only get output of 11.42 volts on low to 12.21 volts on high. Is the unit operating properly?
Document: NOTE that these light strips MUST be used on DC current, as AC will burn them out fast, and make them flicker.I used an old 12 volt 3 amp security camera power supply. I tested and tested and determined that this power supply can easily light up two of these LED light strands.
I am doing a complete update and restoration on a 30-year old 24 foot sailboat. These 12volt DC controllers are perfect for diming LED lighting strips installed as indirect cabin lighting. This allows lights to be on and adjusted to a pleasing level since LED strip lights can be a bit harsh when running at full 12 volts. This also works well with the RED strip lights installed for night vision even when the hatch door is open, to prevent blinding the person at the helm.
I got this for slowing down a 12V DC pump motor. Works great. Nice, detachable wiring block.When using it with a motor, I noticed that it started getting hot. Motors generate significant reverse voltage spikes on the line in between the PWM pulses and you must have a "flyback" diode across the output. I tried a standard 50V 1A diode and it got pretty hot and still the controller got warm.
I stumbled upon what turned out to be the perfect solution - this Dimming Controller.Yes, it does appear to handle up to 8 amps @ 12 volts - it certainly handles 4 amps easily. As others noted the adjustment is a bit touchy - most of the adjustment of brightness is in the first 45 degrees of rotation and the rest of the 270 degrees of rotation are a variance of 90% brightness to 100%. I will try to add a photo of the finished project another time!
I hooked this up to a 12v car cigarette socket to vary the power output of a portable spotlight and it works great. Easy to wire, smooth control from dim to bright, and very small in size. A very faint tone is heard when used as with just about any dimmer control.
You put it "backwards" across the output of the dimmer -- the "bar" end of the diode goes toward the "+" side of the output, and the opposite end of the diode goes to the "-" side of the output, right across the output wires. I wrapped the wires around the thicker wire ends of the diode and put them into the wiring block holes and tightened down on the whole things.
Nice price for a good quality dimmer. I haven't tested for rated capacity, but this dimmer works well. My LED strips start glowing just a little above the off position. Some reviewers complain that there is some travel before their electronics connected to it starts working. That is not necessarily an issue with the dimmer. I think it works fine. The knob travel is much more than the graphic shows, but that doesn't bother be.
The box is easily modifiable if you want to replace the potentiometer with a longer shaft version. There is a 3-output dimmer available elsewhere that I also use to control three different light strips from one manual box, even though that PWM dimmer box is sold for RGB light strips. It's less expensive that buying 3 separate dimmers and works well to individually dim the counter lights on the left & right, while the third dimmer dims both ceiling directed strips.
Device did not work when I got it. The Leds stayed on and did not dim.I posted a one star rating.Seller contacted me and said that if I removed my one star ratinghe would ship another unit.I removed the one star rating and waited.It has been over a month and I have not received a replacement.I rate it one star...again.
This dimmer works well and dims smoothly across the whole range until you get very dim I would say below 10 %. It's a bit unstable under that level, which affects one of my applications, but the other it is not an issue as I only dim to perhaps 25 %. All in all a great product if you don't need to go all the way to zero.
Answer: no