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Safety whistles have been used for personal protection for a long time.  Current technology provides a high volume safety whistle emitting 122Db ear-piercing shriek at under $7.00 in US (no battery required) with basic whistle available for under $2.

Safety whistles have been used for personal protection for a long time. Current technology provides a high volume safety whistle emitting 122Db ear-piercing shriek at under $7.00 in US (no battery required) with basic whistle available for under $2.

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Natalia commented on A Woman Whistles, Community Listens

Thanks a lot. Avi. I am not a material designer, but the best solution would be to design a whistle that makes a specific unique sound that could be recognized by others.

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Natalia commented on A Woman Whistles, Community Listens

Thanks, Bettina. It would be great if you could build on this idea or even turn it in your own.

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Natalia commented on A Woman Whistles, Community Listens

Thanks for the idea. I think this should be technologically possible, the main thing is to make it very loud and to educate the community about the meaning of the call.