Anti-Bark Training: DogRock's anti-bark collar for dogs teaches them to relax and trust, rather than instilling fear. With this anti-barking device, you can conduct highly effective and painless anti-bark training. Vibration & Sound: This dog anti-bark collar combines two vibration modes and 7 levels of volume adjustment, allowing you to gradually progress with anti-bark training. The dog vibration collar automatically provides instant feedback tailored to your dog. Smart Fine-Tuning: The dog vibration collar is equipped with a smart microphone. It only reacts to your dog's barking. The 5 levels of sensitivity on the anti-bark collar allow you to adjust it to the surrounding sounds.