Review of the Sound Defense K9 Warning Device - Dog Deterrent Repellent [ Ссылка ] : Sound Defense offers a humane dog deterrent repellent used by cyclists, walkers, runners and professionals around the world. It uses patented technology to send an audible signal in dogs' sensitive hearing range that’s designed to repel aggressive dogs. It is a hand held electronic dog deterrent made of high impact plastic that emits a very loud, audible signal.
