A collarless way to stop excessive barking with a sound only your dog can hear This tabletop device automatically stops your dog’s nuisance barking, no collar required. You can restore peace and quiet in your home by simply placing the Indoor Bark Control on a table or counter in the room where your dog barks the most. Then, whenever your dog barks, he will hear a 2-second ultrasonic tone to discourage him from barking. You can set the unit to go off automatically every time your dog barks, or you can manually press a button to activate the tone sound. After consistent training, your dog should bark less within only 2 weeks. Your pet deserves the best. Trust PetSafe® to help keep your pet healthy, safe and happy. Features Discourages nuisance barking; no bark collar needed Tabletop or handheld use Works on all dogs within hearing range; for dogs of any size Add extra units for coverage in multiple rooms Range up to 25 feet Water resistant Low battery indicator Measures 5 in W x 3 in H x 2 1/4 in D