Deterring a barking dog is made simple with this barking control device. Perfect for all environments. Made exclusively for PetSmart. Great for controlling barking and bad behavior Can be used as a training device Effective up to 15 feet away Indoor/Outdoor use Will work on any dog within rangeStop annoying barking anywhere with the SunbeamA,A Handheld Sonic Egga,, handheld bark control device. The Handheld Sonic Egga,, is a harmless and effective way to correct unwanted barking behavior. With a simple press of a button, the Handheld Sonic Egg emits an ultrasonic sound that deters the dog from barking. It is safe and pet friendly and emits a sound that only dogs can hear. Warning: This ultrasonic noise device should not be used less than 12 inches from a human ear. This device should only be used for deter barking. This device should be kept out of reach of children. This device is not intended to protect against aggressive dogs.