Pretty good, but sometimes it vibrates without the dog barking and doesn't vibrate when it barks, it depends sometimes.

It has arrived correctly. I have adjusted the strap and tested it with my older dog, and it works.

Perfect, easy to use, activates with just a bark.
I love that it's just sound and vibration, I don't like the downloads. It has worked for my dogs because it rings twice and we have improved a lot.

It works perfectly, since I put it on it barks less and I like that it acts instantly, you don't need to press the button like other products, it detects the bark quickly and emits sound and vibration.

Highly recommended for stopping the dog from barking