Help stop your dog from excessive barking with this Ultrasonic Bark Prevention Dog Collar featuring an advanced device that senses barking and emits ultrasonic high pitch sound that only dogs can hear on an adjustable elastic collar. The pitch is designed at a level which dogs dislike to make them lose concentration at what they were barking at. This device is harmless to your dog - no electric shock. 100% humane and safe. Elastic collar expands from 9"-15". Batteries and instructions included. Comes packaged in a hanging box.,Ultrasonic Bark Prevention Dog Collar,