Description Product description Adjust the height, whistle your dog, easily teach your dog unlimited commands such as sit, go home, stop barking and more. of quality alloy, strong, rustless and durable. Mini size but clear sound, emit ultrasonic sounds that dogs can hear to control your dogs by stopping unnecessary barking. Small size, easy to put in pocket and carry. Keep your whistle commands consistent and your dog will know what you expect of him, change your dog's behavior through training. : 100% brand new and high quality. of quality alloy, strong, rustless and durable. Mini size but clear sound, emit ultrasonic sounds dogs can hear to control your dogs by stopping unnecessary barking. Adjust the height and whistle your dog, easily teach your dog unlimited commands such as sit, go home, stop barking and more. Keep your whistle commands consistent and your dog will know what you expect of him, change your dog's behavior through training. Small size, easy to put in pocket and carry. The whistle with a keychain can be hung on your keychain or bag, not easily lost. s: : as shown Material: Alloy Product length: 5cm/2"" Function: Dog , Communication Note: Please allow 1-3cm (0.4-1.18") differs due to manual measurement and a little color variation for different display setting. Thank you for your understanding, have a nice day Package including 1 x Dog