If you have dogs like mine that bark just for fun, over EVERYTHING, and you want ton fix it buy this birdhouse. It worked instantly! We have 3 very vocal dogs, a german sheppard (THEY ARE NOTORIOUS BARKERS)and 2 little yippy dogs. It has even helped with their indoor barking, they definately think twice before they do it. I am not telling you anything but the truth, I wish I had bought this months/yrs ago. It has helped even our neighbors dog who would get it a bark-off with our dogs. Now they are angels. It has only been up for about 14 hrs. and I feel compelled to promote this product to anyone considering buying it. It is well worth the money!

Because every dog is different, this bark deterrent may not work on every dog. Therefore, you take a little gamble when you buy this product for whatever dog problem you are trying to solve. Luckily, it DID work for my situation. When I look back on all the disturbed sleep I have had (off and on) for the last several years, it makes me wish I had found this product much sooner.
My problem stemmed from our neighbors, who would go on vacation every summer for at least 2 weeks. Their 2 beagles had the run of the place while they were gone.(They could go in and out of the house through a doggie door) Of course, they had someone come by to feed them every day, but because they were unsupervised the rest of the time, they would sleep through the heat of the day and then wake up at night to bark insanely--not for just a little while...not for just an hour...it would start around 10 pm and continue till 6am. Scolding them made it worse.
This year, after the first night, I was determined to solve this problem (without taking sinister measures, which I had fantasized about), so after some research I decided to try this product and it is WORKING! Every so often, I will hear them bark once or twice, but that's it. I am so pleased!
I would recommend following the directions closely--ie...don't hang it higher than 5 ft.; no obstructions; play with sensitivity controls, etc.
If you are contemplating trying this bark controller, I would say "go for it and see what happens".

We have two chihuahua mixes next door (as in, 5 feet of space between their house and ours) that arrived 6 months ago. The owners bought them for a grandmother living alone, dump them in the back yard, and never walk them. The grandmother is deaf and doesn't hear them barking (or, after months of this, me yelling at the dogs to shut up). Aside from being a hyper breed already, of course with this kind of treatment any dog would become high strung. These dogs barked at EVERYTHING. Squirrels, people walking by (across the street and on the other side of a 6 foot privacy fence), even myself if I was in the back yard area. EVERYTHING. We tried a different product where you point it at them to get them to stop, but that didn't work. The Petsafe Outdoor Bark Deterrent arrived two days ago and there was an immediate difference. They still erupt into a few barking frenzies, but 90% of the time they self-moderate and pipe down quickly. I have some concerns that they might start ignoring the sound over time, but I don't even have it set yet to the highest sensitivity level, so I think there's still some leeway if they go that route. Sigh...I can't believe some people treat their dogs the way these guys treat theirs.