I'm glad it worked for you but to me it's the same as smacking your dog, collar correcting your dog, scruffing her, grabbing and holding her muzzle etc. This one just does not involve you touching her, you can do it from a distance. It may not seem like it hurts but it does enough to make her stop.
When driving my sister's SUV, a single window opened causes a strange vibration in my ears. Two windows somehow evens out the wind flow and the effect disappears. If someone puts a single window down, I literally start to freak out. There is nothing painful about the vibration, nor am I scared, but I absolutely can't stand that feeling in my ears.
Now, I am not going to say that the bark collar hurts or doesn't hurt a dog. But, I think there are aversives that are not painful. The citronella collars are a great example. They do work for some dogs (til they break), but I'm pretty sure they don't cause pain to any dogs.
FYI- I recommended the citronella collars to clients for a few months many years back, but almost every single one broke within a few months, they weren't particularly effective for bigger, tougher dogs and they were much more expensive than bark collars.
I agree with the poster who warns against bark collars that go off when dogs put their heads down or bump the collar against something. Or, even worse, collars that are noise activated and go off when a different dog barks
- totally abusive and not effective.
I have never had problems with my tri-tronics bark collar. I kept it on my old dog religiously when he was young and riding around in my truck with me as a youngster (at a very low level). Even now he is quiet and well-behaved in the car but will bark if someone comes close enough. The bark collar did not eliminate the barking at the very low level, but it discouraged nuisance barking, which was my goal.
If you are going to buy any collar that shocks, don't buy the cheapest one- buy a good quality collar that is reliable, trustworthy and comes with very low settings that you do not find painful on your hand. Better to start off with too low a level than to scare the heck out of your dog with a collar that is too strong for him.