No noise to others: The dog whistle can emit ultrasonic waves. The dog can hear the ultrasonic waves emitted by this whistle, but people can’t, so you don’t have to worry about disturbing others whistling. The dog whistle The ultrasonic dog whistle will not harm the dog’s hearing, so you can use this whistle to prevent the dog barking or train the dog to perform various actions. Anti Lost Dog Whistle: High quality lanyard can help you wear it around your neck, you never worry about losing it. Easy to operate, the dog can clearly distinguish the ultrasonic waves emitted from the dog whistle, and the owner can use the dog whistle to give different instructions to instruct the dog to do different actions. Note: This dog whistle will not immediately instruct your dog. You must train your dog with this whistle so that the dog can understand your commands. We recommend using motivational methods to train your dogs and make your pet a well-trained friend.