Size: whistle 8*0.7cm; lanyard 49cm Stop Dog Barking: When your dog or neighbor's dog keeps barking, gently blow the dog whistle, the ultrasonic frequency from the dog whistle can easily attract the dog's attention and stop barking Absolute Safety: The dog whistle is made of 304 stainless steel. Ultrasound frequencies attract dogs' attention without damaging their hearing and without any health problems Remote control: Ultrasonic waves can travel 1000 meters. After training, even if the dog is not in your field of vision, the dog can make corresponding actions (sit, paw, lie down, get up, heal) according to your whistle. Use the dog whistle to let the dog come to you at any time without shouting For All Dogs: Silent dog whistle is suitable for all dog breeds, including (Labrador, Scottish, Golden Retriever, German Shepherd, Beagle). You can always get in touch with your dog