No electric shock, no liquid propellant is used. It is the safest, most humane and used widely way to keep your own dog or your neighbors dog from barking. Your spirit will be getting better and better, your work will be more and more efficient, your sleep will be guaranteed. For full understanding of this Dog Silencer please read and follow the instruction for installation, maintenance and operation. Power: 9V Battery(battery not included) Stop Your Dog, the Neighbor's Dog or Even Multiple Dogs from Barking by emitting harmless high-pitched ultrasonic sound which can be heard by dogs as far as 50 feet away but is completely silent to human ears! Can effectively prevent your dog from barking. Can effectively prevent your neighbor dog barking. Can prevent the dog barking at a particular time. Train the puppy without barking. Prevent the dog from barking at camping. Four adjustable ultrasonic volume levels How it works: When the outdoor bark control is within range of a barking dog,an internal microphone pick up the sound and the unit is automatically activated. The outdoor bark control emits an ultrasonic sound.the ultrasonic sound can be heard by dogs but is silent to humans. Startled by the high-pitched sound that is safe and effective,the dog should stop barking,it will associate its bark with this unpleasant noise. When the dog stops barking the ultrasonic sound also stops. The outdoor bark control has 3 range levels and a test mode.
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