Petsafe Outdoor Bark Deterrent Description If your neighbours dog is driving you bonkers with his barking, help is here! Our 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 15 metres away and has 3 range settings. Whenever your dog or your neighbours dog barks, he will hear a safe, high-pitched sound (inaudible to humans) that will cue him to stop his annoying habit. Range: Up to 15 metres. 3 range settings. Durable and weatherproof. Two-color LED for good/low-battery indication. Instructions and packaging in EN/FR/NL/ES/IT/DE.