Type:Silver Metal Pet Whistle Dog Recall Training Obedience Dressage Door Stop Bark Color: Chrome Silver Material: Chrome Plated Brass Length: 2.0" (approx.) Key ring loop included A good Training Tool for your pet . This sound can be heard by the man, which helps the owner at the beginning of the training to produce a long or short whistle. Adjustable pitch - simply tighten or loosen the screw to work out your dogs frequency It should be noted that this whistle is audible to the human ear, essential for gauging its efficiency Packing content: 3PCS x Dog Training Whistle