Voberry Small Ultrasonic No Bark Barking Pet Dog Training Shock Control Collar New Train your dog to stop barking. Ultrasonic and audible mode selections. Audible: creats harsh buzz to stop barking. High and low modes ( high for big dogs, low for small dogs) Dogs quickly learn that their barking causes this irritating sound and stop barking to stop the noise. Voberry is a protected tradeMark