If your neighbors dog is driving you bonkers with his barking, help is here! PetSafe's ultrasonic outdoor bark control unit looks like any ordinary birdhouse that can hang in a tree, on a fence post or anywhere outside. It detects barking from up to 50 feet away and has 3 range settings. Whenever your dog or your neighbors dog barks, he will hear a safe, high-pitched sound (inaudible to humans) that will cue him to stop his annoying habit.