The Pet Life ® Anti-Shock Ultrasonic Waterproof Safe Anti-Bark Training Dog Collar is Waterproof and Utilizes a specific Ultra-Sonic Frequency vibration that safely reduces or completely eliminates dog barking without causing shock harm. This Anti-Bark Collar also has an audible setting that can be turned On or Off that further helps Decrease Barking. The Collar is also adjustable and suitable for all dog neck sizes. This Ant-Bark Dog Collar is a safer and healthier alternative to training your dog.