There's no doubt the whistle is comfortable to use and can be kept in the mouth without much effort, but its lack of loud volume is a downside.
The design allows it to be easily held in the mouth without discomfort.
The whistle does not produce sufficient loudness for desired use.
Comfortable to hold during mouth movement is a preferable choice.
There are users considering counterparts.
"Comfortable to use all day long. The band makes this easy to keep between your teeth during use without biting down hard. Not very loud though."
"not exactly what I expected, but I will give it a try. it is not very loud."
If a loud whistle is a must, you might want to consider alternatives. If quietness is less concerned, then this product is still fine for use.
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