Doesn't work properly
581254
This worked well for a few weeks and then it would no longer stay snug in the cup. We have tried everything and we cannot get the expanders to snug up in the cup. I do NOT recommend this product.
4326400
This product is inconsistent. It does not always turn on. I have no idea what the problem is. I have 2 one works and one doesn't.
1758295
I gave this as a gift and the recipient reports that it is a disappointment because it does not work properly. It has a circuit issue and will not run in the way it was designed to run.
1905708
Not Enough help

It Don't work all the time. I like the concept I purchased 3 So far.
They all disappointed me great Idea. If I Could get it to work Any Suggestions
3559744
I ordered this at the end of September.  I finally ran in the dark with it only to find out it doesn't work properly.
4023478
Item never worked properly. It works (sometimes) and only in one tone. When an attempt is made to use other tones, it shuts down. I need to have it replaced.
4482192
I'm very disappointed with this product. It doesn't work often. I press the bottom & nothing happens even when it is charged. I was going to return it but thought I would continue to try it & now it to late to return it I purchased it 2 months ago.
1811810
i like it, but it doesn't work as its supposed to. the control button had to be held at all times when on, and i had to use tape to make it work. I'm a try returning it, or getting it replaced.
3425772
Does not work properly. I bought this knowing I was getting my wife a puppy for christmas. I set the boundaries checked the batteries bought a second collar. I set the perimeter in the yard. it works intermittently. I cant trust this device! Contacting Amazon now, they suggest i sell it! WOW!
2559510
This is my 2nd one- had to return the other because it malfunctioned. I've only used this one twice and it doesn't work properly but it's past the return date.  I will not give this item a 3rd try.
1796038
This one does not perform as it should. Thought I was purchasing a new product, but it works like a used one.
951019
This product has never worked correctly since it arrived. Once I tinkered with it and improved the battery connection it did work ok, but I continually have to work on it.
3525116
And sometimes it does not work correctly.  I have not contacted the seller for an exchange--it's not worth the bother.  When it does work--it works fine.  It works about 90% but occasionally shuts down early.  Strange.
1269192
Does not work properly. It does obtruct the air too much. Had no time to return. Perhaps removing the tip's core will make it usable. There is more air coming out from the side holes than from its tip.
853421
I'd have to say poor right now because it doesn't work properly. Still learning all functions. Not as easy as it says
1127950
The reason why I'm giving it a one star bc the things keeps skipping n just doesn't work right. Next time send it To me turned off.
3835029
First one i bought is still working fine. Although the second one isnt. It's not broken physically, but only works when it wants to. I also want to return this. Guess I'll jst have to buy a more expensive one.