This silent dog whistle is a quality metal whistle made by Acme in England for many years specifically for dogs. According to the manufacturer, this silent dog training whistle is effective up to 400 yards (365 meters) depending upon wind, weather, terrain etc. When you blow this whistle, you can hear the air going through it, but other than that it is practically inaudible to most humans. The pitch is adjustable and instructions on using this whistle while training a dog are included.
