Specification: Item Type: Pet Training Whistle Material: Plastic Single Size: Approx. 7 x 3cm 2.8 x 1.2in Suitable Pet Type: Dog Product Function: Training dog to eat, or to call the dog Package List: 1 x Whistle 1 x Black Whistle 1 x Blue Whistle 1 x Orange Whistle 1 x Light Blue Whistle Note: Please allow 1-2cm error due to manual measurement. Thanks for your understanding.?Multi Purposes Training Bell?Not only can the practical dog training bell be applied to games, potty training, housetraining and housebreaking for your pets, but also are suitable for desk call bells for stores, restaurants, bars, hotels and so on. ?Dog Clicker Features? Teach your pet basic obedience skills and advanced movements as you whistle different demands Dog whistle is good for training puppies and young adult dogs. ?Durable to Use?The dog training kits are made of metal and hard plastic, safe and durable to use, can serve you and your dogs for a long time, and the compact size of the dog training accessories allows you to carry them easily and conveniently. ?High-frequency Sound? Whistling with your mouth produces high-frequency sound with excellent penetration. This better ensures that it can be used in different environments. ?Dog Clicker and Whistle? 2-in-1 function design of sounder and high-frequency whistle. Press the heart-shaped button by hand to make a big clattering sound.