Very Good
I purchased these collars for my 2 Jack Russell Terriers who loved to bark at any animal late at night or at 4:30 in the morning. After receiving unsigned letters from my neighbor, I purchased the collars. Jacks are extremely smart dogs and it did not take them long to learn what happened when they barked. I am extremely pleased with the result as they have controlled their barking when not wearing the collar.

dog collar
works as advertised.turned a dog who barked at almost any living thing into one who stopped barking after 1 or 2 mild shocks.

terrible
I sent this back 3 times because tt wouldn't work for more than a few h ours - - I also ordered the batteries they sold with the product - -and they were not the correct ones (there is no return with the batteries). I never got to actually use the product, because it actually never worked, even after the 3rd replacement! The citronella collar worked well for a year, but then also quit!

bark collar is effective
my berger picard had extreme separation anxiety when i left for work each morning. neighbors complained and my dog was wearing herself out. i researched solutions and with hesitancy decided on the bark collar. it arrived very quickly and was easy to use. it has halted my dog's barking when i am away from the house. i use it only when i am away from her. the neighbors no longer complain.

Works fast!
The collar comes on an adjustable red, nylon rope that was able to fit my 10 lbs dog's neck. As the dog barks, the collar will emit three warning beeps before actually shocking the dog. The shock isn't that strong (I rubbed the collar against my pant leg, it feels like a strong hand buzzer), but it was strong enough to make my dog stop barking. This collar works fast too--within two times my dog has learned to stop barking and has a calmer demeaner.

My only issue is that the collar is not able to eradicate the whining/crying noise of my dog.