Ultra sonic indoor bark control unit, easily control your dog's indoor barking with safe, ultrasonic tone, place this compact unit in any room of your home, when microphone picks up the sound of your dogs bark the unit emits an ultrasonic tone that can be heard by your dog, but is silent to most humans, startled by the high pitch tone the dog should stop barking as it will associate its bark with the unpleasant noise, no collar needed, detects bark up to 25' away, low battery indicator, free standing or it can be adhered.