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BarkOff is an ingenious, ultrasonic training aid that allows you to be in control of your dog's irritating, uncontrollable barking. When Rowdy starts tuning up for some high decibel barking, just flip the switch on your BarkOff device, and an ultrasonic signal -- inaudible to human ears – quickly catches his attention and interrupts his barking pattern. This ultrasonic signal actually teaches dogs the difference between nuisance barking and barking to protect your family and home. About the size of a TV remote, BarkOff is small enough to fit in your pocket, and you can take it with you anywhere you take your dog.