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Button whistle / Button

Button whistle

This is a button can be used to call for help.Users can pull out this button from their clothes and blow it by their mouth to make a loud sound to attract people by attention in emergency.
Button Whistle can be used in many different occasions. Such as when the dumbs encounter robbery or other threats of violence or in case of earthquake, buried under the ruins of the people can't shouted for help.

University

Southeast University

Southeast University
NanJing, China

Hong Liu,
Southeast University

Jiawei Lin,
Southeast University

GengJie Zhang,
Southeast University