Quote:
This device has two settings, ultrasonic and audible. When set to ultrasonic it will NOT be heard by humans. Humans can hear the audible setting. Both settings are effective at deterring dogs from barking. When a dog barks within 25 feet of this device it will respond by blasting the offending dog with a strong ultrasonic blast up to 120 dB. This level of sound is like an airliner coming in for a landing. The sound is emitted for only a few seconds after the barking stops, and then resets itself. Bark Free comes with a rain cover to increase the flexibility when choosing a place to mount it. It comes with its own 12-volt converter and 50 feet of cord, thus no need to worry about replacing batteries. We offer a free 30-day trial and the manufacturer’s warranty is for two years. This device can be set so humans cannot hear it.
That dog will be deaf soon. :o