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PetSafe Indoor Bark Control is an indoor collarless bark control unit that is automatically activated. This device uses ultrasonic sound waves which are inaudible to humans, yet irritating for dogs - to reduce nuisance barking.
When the Indoor Bark Control is within range of a barking dog, an internal microphone picks up the sound. The unit automatically emits an ultrasonic tone that can be heard by dogs but is silent to humans. Startled by the high-pitched tone, the dog will stop barking. In time it will associate its bark with this unpleasant noise. When the dog stops barking, the ultrasonic tone also stops. It is effective up to 8 metres.