Dog Silencer – In fact, the Dog Silencer claims to be able to stop barking up to 300 feet away, and is touted to be the newest and most powerful indoor/outdoor bark control device on the market. Fret not, it will not make use of nasty chemicals to get the job done, but rather, will rely on harmless ultrasonic frequencies that are deemed to be a safe and humane manner to train your dog as well as that of your neighbors. | Coolest Gadgets

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