I honestly didn't know if this would work or not, but I thought it wouldn't hurt to try. Our neighbor's dogs are always out barking at us when we are trying to enjoy our time grilling and we can barely hear each other over them barking. As soon as I heard the dog run over to the fence and start barking, I pushed the button and literally within 2 seconds the dog stopped barking. He paused for a min and barked again and when I pushed the button for a second time he stopped and ran away from the fence which never happens. I was thoroughly impressed and elated that we could finally enjoy our time outside in peace without the barking. I gave it to a co-worker to try who was also skeptical, but after I told her what happened, she was eager to try it on her pugs who won't leave the neighbor's dogs alone when they're out. She tried it as soon as she got home and they too also stopped and moved away from the fence, did their business and went back inside. Her mom's dog however was a different story. Her mom's dog is older and any loud noise in general scares it into having minute long seizures. She said when she turned around after having successfully used it on her dogs, her mom's dog was on its side, having a seizure. It lasted for a minute but then was ok. She won't be using it again since her mother's dog is always around her pugs and she doesn't want it to have another seizure, but she was impressed with what the device could do. I myself have tried it at work to see how it would do on the dogs that bark excessively and it seems to only work on dogs roughly 2yrs to 9yrs. As dogs age, just like people, their hearing changes and they can't hear at certain decibel levels. This doesn't mean that it will only work within these age ranges because each dog is different. I will say to be cautious with the sensitivity that some may have to sound as it may have an adverse affect. You can't personally hear the high pitched noise as when you push the button you can only really hear what sounds like a soft static noise coming through the little speaker, but obviously since a dog's hearing is better than a humans, they can hear the intended noise. Wouldn't hurt to give this device a try and if it doesn't work for your dog, it may work for your neighbor's.

Just got this product so I can't say yet if this works on my dog. But was frustrated when I couldn't figure out how to open the battery compartment and there are no instructions as to how to do it; finally figured out but broke a little piece of it. The batteries that came with it didn't work; thought I couldn't figure out how to turn it on until I replaced the batteries and realized it was just bad batteries. Dang, it was a little frustrating trying to get this thing going....it also came with a SIM card tray eject tool pin key needle that I don't know what for; again nothing in the instructions on this. If this doesn't work on my dog, I hope they let me return it despite the little broken piece from not being able to figure out how to open the battery compartment.

I am a person that normally reads reviews before buying a product, and it was no different with this purchase. We have two Labradors, one that just turned 11 and the other is 1. I made this purchase to use more as a training aid for our 1 year old to break him of some unwanted habits that we weren't being successful with as part of our normal training. As most young labs are prone to do, he loves to put everything in his mouth outside, plus likes to take shoes, and remote controls. Reviews were mixed on this particular item with people saying it didn't work at all to others saying it worked great. In the end it seemed like a product that worked to some level and was very easy to use, so, decided it was worth a try for $30.

The day we got it, which by the way came early by a day or two, I had the chance to use it. Our 1 year old had taken a shoe and would not release it. I gave him many repeated commands to leave it, but he wanted to play with it. I pushed the button for less than a second and WOW, it worked like a charm. I could not believe it, he dropped the shoe right away, and came by my side. In the few weeks we have had it, we have only had to use it a handful of times. It has worked every time on him. He now listens and responds to our commands much better. If he is starting to perform a behavior we don't want, and he won't respond to our verbal commands all we really need to do is show him the control and he obeys. It has been a great addition to our training.

Having two dogs, we did have concern with using this to train our 1 year old and it accidentally also affecting our 11 year old that might be within range. It is a dilemma you will have to work out if you do have two dogs. However, for us it appears as it does not affect our 11 year old. We have used it a couple times when our 11 year old has been in range of our 1 year old, and it doesn't seem to phase him. So, I am not sure if it is his age and his hearing is not as good as it used to be and this frequency doesn't affect him, or, he is just a salty old man who has a tolerance to it. :-) Not sure, and we never have reason to use it on him, so, I don't know if holding the button longer would affect him. So, to the point other reviewers made this may not work on all dogs.

Our neighbor has two dogs as well (Rottweiler and Rottweiler mix), and one is a barker when he is outside and sees someone. They have been frustrated, because they have not been able to correct him of it and have even used a training shock collar. That has worked, but not consistently. So, instead of being able to have the dog outside with them, they usually keep him in the house because of the barking. We were outside talking, and the dog started barking when they saw us, and I told them about this device and about the success we had with it on our 1 year old. He asked if he could try it, and he went over to their deck where their dog was barking pushed the button for less than a second and their dog stopped barking right away.

I have no feedback on battery life. It takes 2 AAs, and we have used it so little I don't know how long they should or will last.

The only negative thing I have noticed is it is easy to accidentally press the control button if you have it in your pocket or aren't paying attention to how you are carrying it. It doesn't take a lot to press it down, as the button is basically flush with the case. So, watch out for that.

Overall we are happy with this purchase, and our results to this point have been great. It is doing what we hoped it would for helping us in our training.

This is an excellent training device. It is not loud and does not hurt your dog at all. I just beep it once when my dog is Barking or doing something she shouldn't do and she immediately stops.

We bought a house a while back. Our neighbors have a dog which is large and mean. This creature barks loudly as it throws itself against the heavy wood fence. The entire time it is outside it does this. For breaks, it just sits and growls in a deep and threatening way. The dog recently upped its game by waiting for us to do something in our house: dishes with the window open, even walking across creaking wooden floors. We cannot be in the house in peace. I will sit on the front porch in silence, it will smell me and growl in the Threatening Way. It just wants to kill us. It just hangs on inside of his home's fence, dreaming of death. We dream of quiet.

The neighbors say oh it's friendly and they are so in denial, which is helped by beer. They will put it away when we say we have to mow the lawn. Other than this Obnoxious Denial Dog Thing, there is no problem with them. Our neighbors on the other side have three large guard dogs, and those dogs are never like this, a dream of Well-Behaved.

The hellion dog broke our fence in two places trying to get to us. A big, sturdy fence, just ripped the heavy screws with plates out. The neighbor did fix it, but it just doesn't sink in that their pup is a menace. We considered carrying mace when in the yard. It is that bad. We looked the neighbors' information up because we are sneaky and saw their house is in end stage foreclosure and short sale and we so want them to just leave without starting problems with HOA and authorities but legal foreclosure stuff is just not happening and we are losing it while we're waiting. It's worse since the pandemic and my husband works from home on the phone.

Enter the Modus ultrasonic Dog Bark Deterrent. When it arrived, I ripped off the packaging (batteries are in it), dog of course is barking loudly, I take it out, walk towards the beleaguered fence, *ZAP* every single time it barks, growls, throws itself against the fence. It took about a minute the first time to get it to shut up. It worked right through the solid wood fence! It still paces and freaks out, but is quiet. It has been about a couple of weeks and it still tries to bark, but stops after a couple of barks. It whimpers, goes quiet and I grin. I don't torture the dog of course, as soon as the barking stops, so do I with the zapper. It barks a whole lot less in general these days. We bought an automatic one now so that zaps it too if we aren't around. The dog is so frustrated it now goes the the neighbor on the other side of the fence, which is quieter for us, but it doesn't seem to be the same for it and it gives up. It hates us more. Or maybe they zap it too; who knows? It is a whole lot quieter in general now. We smile and wave at the neighbors, who don't know of our silent diabolical plot. We all get along, they will eventually have to move on with the dog, without any drama. We'll keep the zapper because who knows if the new neighbors will have a loud dog. Hehehe. Also it might be useful for bicycle rides and walking. *We were not compensated in any way for this review.*

TL;DR: This works on our neighbors' loud vicious dog.