The Pet Life Non-Shock Safe Anti-Bark Training Collar for Dogs is water-resistant and utilizes a specific ultra-sonic frequency vibration that safely reduces or completely eliminates dog barking. The anti-bark collar also has an audible setting that can be turned on/off that further helps decrease barking. The collar is also adjustable and suitable for all dog neck diameter sizes. This anti-bark collar is an appropriate, safe and healthy alternative to training your dog. Train your dog with ease and promote better behavior with this dog training collar.