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Dog Whistle To Stop Barking Bark Control For Dogs Training Deterrent Whistle Puppy Adjustable Training Adjustable pitch, simply tighten or loosen the screw to work out your dogs frequency It should be noted that this whistle is audible to the human ear, essential for gauging its efficiency. Some tips to use the dog whistle: Adjust the pitch & blow the whistle to your dog. Even dogs can't hear all frequencies. Wait until he is asleep and gently blow on the whistle. Your whistle has a nut and screw that adjust the frequency when turned. Continue testing until your dog perks up. You will then know you have reached a frequency he can hear. Use the dog whistle with varying sequences to train your dog. For example, one long burst can mean "come", while a series of short, staccato bursts might mean "sit". Keep your whistle commands consistent and your dog will always know what you expect of him. The dog's behavior according to your instruction need to be trained. Such as, at meal time, blow on the whistle before they get the food. It will only take a few times of doing this and your dog will react quickly Color: Silver Material: Stainless steel Length: 5.5cm Package Included:1pcs Note: The dog whistle sound includes 2 parts. Part 1: the Ultrasonic. Human\'s ear can not hear it, but dog can hear it. Part 2: These light sound can be heard by human, which help owner sound a long or short whistle to train them.