Either serves no purpose or is defective.
343678
I purchased the "On at 35 / Off at 45", but when the first cold snap hit, it still had not come on at 24 degrees.  Not good when it is needed for a heat lamp preventing my water pump from freezing.  Unfortunately, in this case, I had prepared ahead for winter with my purchase instead of waiting for the first freeze, so too much time had passed for me to be able to return it.  I don't believe I will try another, but instead will just keep the heat lamp on in the pump shack 24/7.
1017890
The unit itself has no intelligence.
It is just an auger and a motor inside, and relies on a generic wall timer that you can get at any hardware store.
I suppose this is as good as anything as long as it works, right? But it's not a modern, elegant solution to the problem.
I ordered the small size, but received a defective medium unit stuffed into a small size box.
The scheduled RMA pickup never happened before my trip. I had to go to PetCo and buy a different product.
Now I'm back home waiting for another RMA pickup...
2684606
This is one of two we purchased - both were defective within days of putting into service.
Headphone #1 had very spotty and intermittent audio connection almost from the beginning. If it is within about 3 feet, and direct line of sight, it works fine. Otherwise, the audio drops out and skips.
Headphone #2 on the other hand sounded fine, and had decent range - but within a very short period of time, we discovered that it could not be powered off. The multi-function button would power it on once charged from dead, but after that, it could not be put into pairing mode, or powered off. the multi-function button is unresponsive once the power is on.
79703
Original and replacement items both defective out of the box. Why are these items still for salein the face of so many negative reviews?
4359841
Not sure how it works, because it arrived broken and unusable.
910413
I ordered 2 of these, and the first one works fine, delivering appropriate transfer rates.

The second is either a defect or result of a poorly designed product, at the very least indicitive of a lack of Quality Control at the factory.

These come with a rubber cover that goes on the end of the connector, and when the cable is placed in service the protective covers must be removed.

On my second cable, the force required to pull off the cover, also separated the outer jacket from the connector, including the braided shielding inside which is there to provide chassis ground and subsequent EMI protection. This braided shield is clearly paper thin, now that it's become visible.

It wasn't that the cover was on the connector tightly, no worse than the same type of cover one might find on a DVI or VGA connector. It's rather that the jacket apparently wasn't secured inside the connector's cowling where the joint is made.

I only write this review to make people aware that at least in my case, this item has a 50% failure rate.
97678
This device appeared simple to use. I added a brand new 9 volt battery, tested the power button and it worked. I hooked it up to the RJ 45 cable I was testing with the terminus placed at the remote end of the cable (there was no power to this cable except whatever this tester produces)  and there was a brief flash of light, a noise, and then the device was unresponsive. DOA.  I suspect poor QA may be involved. I removed the battery, re-tested it ( it was fine) and replaced it in the device and it was still unresponsive. I am returning it and will resign myself to pay a little more.
3840240
Unable to post a review describing what was wrong with this item.  I am not sure why.
410130
Bought two of these to convert my old standard 1" equipment into the 2" Olympic. The first worked great but the second had a defect so that screw that's supposed to help the adaptor latch onto the original bar did not work. Figuring it was a one-off incident, I returned the defected sleeve and ordered a new one. It arrived and had the exact same problem. Avoid this product, it's not with the hassle.
1264974
A cable is a cable - if it works. This one doesn't work, so it's just a piece for the garbage.
1286605
<div id="video-block-R3GK16AB0KJ9BU" class="a-section a-spacing-small a-spacing-top-mini video-block"></div><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/E1IKWDsiiNS.mp4" class="video-url"><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/91iohMYVsBS.png" class="video-slate-img-url">&nbsp;This unit is cheaply made and the was poor quality assurance. The first problem was that the 9 volt connector was not tight enough so the battery falls off. I was able to tighten it with some pliers easily enough, but that was my first clue that this unit probably wasn't even tested by the manufacturer. This tester has very inconsistent and erratic readings. I think I may have received a faulty unit. If not, the quality is not acceptable. I think this is a case of getting what I paid for. I am returning this and trying out the DE-5000 meter.  See the attached video to see what I am talking about.
1123928
This is totally defective item, needle points randomly to any direction. Quality is very poor, but some functionality still should be expected. This one appeared to be totally defective from the moment I unpacked it. I can not understand, why this product is marked as #1 Best Seller (?!).
2285217
I've purchased two of these.  The first one lasted a month or so, then finally got stuck in the "ON" position, unable to unlatch.  The replacement I pushed once, and it never actually turned it on, but wouldn't unlatch either.  This is only with the red ones.  I have both green and blue working seemless.  Sadly, I'm going to try another brand, which have the button extruding out in the off position, where this one is flush.  I'd rather things work right over look right.
4684882
<div id="video-block-R3MG9LPFKJE693" class="a-section a-spacing-small a-spacing-top-mini video-block"></div><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/A13ooMoMHFS.mp4" class="video-url"><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/714MRjEl68S.png" class="video-slate-img-url">&nbsp;Item is defective. Bottom of touch screen doesnt work.  Bottom row of buttons and swipe up don't work.

Update: returned for a refund (earned second star)  and ordered another replacement. Dont bother discussing with the vendor, it was a waste of time. Let Amazon returns take care of it and order a replacement with prime shipping. Second item worked fine but not as bright as original screen.
819902
Can seem to make this product work. How do I know if I'm doing something wrong or if it's defective.
699452
I've purchased this twice returned the 1st one and looks like I need to send the second one back too both seem to be defective but all the reviews seem great I just want one that actually works!
2416471
Why would they sell a product that fails at doing the one thing it's designed to do?! Flimsy and tenuous grip on TV. Item was clearly used. Not sure if manufacturers fault or amazons. Either way I'm too lazy to mail it back so they win again.