Deterring a barking dog is made simple with this barking controldevice. Perfect for all environments. Made exclusively forPetSmart. 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 anywherewith the SunbeamAfA,A,A Handheld Sonic EggAA,A handheld bark controldevice. The Handheld Sonic EggAA,A is a harmless and effective way tocorrect unwanted barking behavior. With a simple press of a button, the Handheld Sonic Egg emits an ultrasonic sound that deters thedog from barking. It is safe and pet friendly and emits a soundthat only dogs can hear. Warning: This ultrasonic noise device should not be used less than 12 inchesfrom 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 aggressivedogs.