Stop Dog Barking: When your dog or neighbor's dog keeps barking, gently blow the dog whistle, the ultrasonic frequency emitted by the dog whistle can easily attract the dog's attention and stop barking. Adjusable Frequencies: Different dogs respond to different frequencies. Our dog training whistle has a nut and screw that would adjust the frequency when turned. Notice your dog's reaction to each setting until your dog exhibits the strongest reaction. Absolutely Safe: The dog whistles is made of 304 stainless steel. Ultrasound frequencies attract the attention of dogs without damaging their hearing and without any health problems. Remote Command: Ultrasound can travel up to 1000 meters. After training, even if the dog is not in your field of vision, the dog can make corresponding actions (Sit, Paw, Lay Down, Up, Heal) according to your whistle. At any time use dog whistle to make dogs come to you, no need to shout. Suitable for All Dogs: Silent dog whistle suitable for all dog breeds including (Labrador, Scottish, Golden Retriever, German Shepherd, Beagle). You can get in touch with your dog anytime.