Train your dog and control barking in as little as three weeks. The Bark Control Collar uses a humane and painless tone to teach your dog to break the barking habit without pain, shock or needless trauma. The collar is activated when ever the dog barks. Use along side your dog’s regular collar, your dog will learn to associate the high frequency whistle with barking and the habit will be broken. Training time varies from dog to dog, but typical training time is 3 to 4 weeks. Requires 1 x 9v battery (not supplied).