Excellent question, Oliver. As Henry had noted, the "pea" in this whistle simply refers to the ball inside the chamber. When blown, this ball rolls around the inside of that chamber. The result is a sound that is noticeably trill, or varying in pitch.

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SportDOGBrand Roy Gonia Special Orange Whistle Without Pea

Q: I have a deaf dog that will hear a shrill whistle to my ears - is this audible to me as well as my dog? thanks!

Thank you for your great question, John. This is not a special whistle; it is meant to be audible to both dogs and humans. However, if your dog is deaf, they will likely not be able to hear it.

Q: How does this work? By negative reinforcement?

there's a lot a whistle does when you train a dog. We conditioned him to associate the whistle with the sit command. He is supposed to sit when he hears the whistle - but it mainly gets his attention. Others use the whistle so the dog knows which way to turn on blind retrieves. Some use the whistle for positive reinforcement. There are tons of videos on training your dog with a whistle. This whistle is loud.