Pros: Design, Durability, Loudness, Materials, Overall Quality
Cons: None
Great, durable whistle
Great sound, titanium, and durable. I purchased for my SIL to use with his new Gold Lab puppy. No little parts to fall out or be damaged. Can be worn around the neck and carried anywhere. Will probably purchase more...the need to signal is paramount, and those little handheld computers (some still call them phones) don't always work for all needs.