[How to train your dog? : You can easily train the dog by adjusting different ultrasonic frequencies, such as stop barking, sit down, lie down, recall, go to toilet training, etc. Please keep the consistency of the whistle command. When your dog does the right thing, reward him with snacks so that your dog can become a listening and obedient friend.[Professional dog training whistle]: The operation is simple, just loosen the sound adjustment screw, and then turn the adjustment lever to obtain the desired ultrasonic frequency. Pay attention to your dog's response to each setting until your dog shows the strongest response. This is a dog whistle that can quickly stop barking. It can help you teach dog obedience and learn basic skills.[Anti-lost design]: Our dog whistle is equipped with a black lanyard, special lock nut and shell. It is easy to hang around your neck, so you can put it anywhere without worrying about losing it.[Safe and durable]: Our dog whistle is made of safe and durable stainless steel. The ultrasound from the dog whistle will not damage the dogs hearing during training, nor will it cause any problems to the dogs health.[Enjoy training time]: Even if you can't see your pet, your pet can hear the dog barking from 25 meters away. This is a dog whistle tracker to prevent dogs from getting lost This dog whistle is suitable for training all breeds of dogs. When dogs are 3 to 7 months old, they will be more suitable for your training.SpecificationProduct size: about 3.14" in length and 0.27" in diameter of mouthProduct weight: about 1.05oz eachProduct material: plastic + copperHow to use: Loosen the sonic adjustment screw. While blowing air in from the air inlet, rotate the adjustment lever to adjust to the right pitch. After the adjustment lever is turned, tighten the sonic adjustment screw.Package includes: 2 x dog whistle + 2 x black lanyard