Brilliant high quality stainless steel construction with stylish knurled grips and a handy cap to keep dust, dirt and lint out of your whistle, exquisite and practical. Wordlessly train your dog with ultrasonic sound; What sounds like a gentle whistle to humans can be heard by a dog hundreds of yards away. Enjoy training your dog, and improve your communicative bond with the whistle. Since different dogs respond to different frequencies our whistle allows you to change and adjust the whistle frequencies to suit your own dog¡¯s hearing. Adjust the frequency until you find the right pitch for your dog, then lock it in with the special locking nut. This product used unique and sophisticated technology, environmentally friendly food grade stainless steel long metal chain, safty and durable. Impact discipline and personally control your dog by issuing sequences that only he/she understand, regardless of their age, gender or breed. Removable chain and key rings offer dozens of convenient carry options: in your pocket, with your keys, on a lanyard, a belt loop, or a backpack. Get a great tool to teach your dog obedience and enjoy watching him learn basic skills and even advanced movements as you whistle different commands to him.