Based on my research of reviews Best Rechargeable Bark Control Collarsof all these products the ultrasonic collar doesn't seem to work very well for most dogs but the ultrasonic systems can be effective. The ultrasonic systems are stand alone devices and are made for either indoor or outdoor use. You simply place the device in your home or yard and when the dogs barks it emits an ultrasonic sound humans can't hear and it distracts the dog from barking.

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