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Review title: Does not seem to work for our dog
Product review: The unit has lights to let you know when it is on (blink green) and when it is sending the ultrasonics (red). But since humans can't hear I can't verify if it is working. It senses when the dog is barking and shows the red light blinking. But it does not seem to slow down the barking. So it could be the dog is just immune to the correction and loves to bark. The unit is moderately low priced and was worth the experiment to see if this would work.
