Dog Training Whistle by K9 Athletix OBEDIENCE TRAINING - Great for training your pet to respond to commands, especially at a distance. LIGHTWEIGHT and PORTABLE - At only 2 inches, you can attach this dog whistle to a set of keys or lanyard using the keyring. ADJUSTABLE - Not all dogs respond to the same pitch. Adjust the frequency of this training whistle simply by turning the screw and tightening it to your liking. NOTE: This is not ultrasonic! It will produce an audible sound! MULTI-PURPOSE - This whistle can be used for hunting, herding, and it can even be used on different animals (birds, cats, etc.) to encourage better communication practices. What are you waiting for? Get this dog whistle for puppy training, housebreaking your dog, recall training, house training, obedience training, and more! With the right training, your puppy, adult dogs, or senior dogs will respond to this dog whistle in no time!