Weebo Pets Stainless Steel Dog Whistle with Adjustable Frequency 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 Adjust the frequency until you find the right pitch for your dog, then lock it in with the special locking nut Quality stainless steel construction with stylish knurled grips and a handy cap to keep dust, dirt and lint out of your whistle 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 4" long, weighs 1.5 ounces