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Q&A Are there sound-based alternatives to whistle signals for group communication?

Whistles can be used to signal to group members, however the downside is that other people may think you are having an emergency. Are there any other devices that would allow you to signal with no...

4 answers  ·  posted 7y ago by Charlie Brumbaugh‭  ·  last activity 6y ago by System‭

Question safety communication whistles