Listing as used but unused just tested.The Sunbeam Sonic Egg SBBCU2 is an ultrasonic anti-barking device designed to deter dogs from barking incessantly. This device, suitable for any dog breed, emits a high-frequency sound that disrupts the dog's barking patterns. With its weatherproof design, it can be used indoors or outdoors without being affected by the elements. The Sonic Egg model by Sunbeam provides a humane and effective way to train dogs to stop barking excessively.