This small whistles are really powerful and loud. 101 dB - with this amount of dB longer duration may damage your hearing .
You can wear it with keys, for security . layer : 0,25 mm, NO support! Of course , after printing , cut off the bottom square. It is only to improve the adhesion of printing.
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Whistle - small, powerful and loud ! ( 101 dB - checked )
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Creative Commons Public Domain
The creator has waived all rights to the work. You can copy, modify, distribute and perform the work, even for commercial purposes, without asking permission.
Licensed under CC0
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