ITEM NAME:Pet Training Dog Whistles Silent Bark Control Whistle Tool Description: The dog whistle has adjustable pitch of the frequency produced. When you blow on the whistle, you can hear the secondary sound made by the air forced through the metal tubing. Description:.Adjust the pitch & blow the whistle to your dog. Even dogs can't hear all frequencies. Wait until he is asleep and gently blow on the whistle. Your whistle has a nut and screw that adjust the frequency when turned.
