CHN'S Professional Gog Cat Pet Training Whistle Obedience Bark Control Silencer Ultrasonic Supersonic Sound Pitch Quiet Command Whistle 100% New and high quality Material: Metal & Plastic Size: Length: 90 mm Weight: 14g This whistle is an excellent and safe deterrent to your pet. The product will be sent out within the same day , you will get it within 7-15 days A blow on this ultrasonic whistle at the right frequency will surely get your pet's attention when nothing else has seemed to work, Train your dog to follow various commands such as "sit", "come" and to change direction by using different patterns for each. Also great for training hunting dogs. For more products, please click "CHN'S" above.