The Barkstop collar is an advanced safe, non harmful behavior modification device, designed to help train your dog to stop barking. It's 100% waterproof which means that your dog can go swimming and it'll still work. The BarkStop collar's waterproof design is built to stand the toughest abuse. Stop driving your neighbors mad! Safely control your dog's barking today.The collar is triggered by your dog's bark vibration. You can set it to both ultrasonic and audible settings. Your dog will quickly learn to associate barking with the ultrasonic beep of the collar. This is an effective training device to control your dogs excessive barking in a non harmful way (unlike some other bark control products on the market).