BEACON Self-Defense Necklace

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After a friend was robbed at gunpoint on her walk home, I designed a wearable alarm for her. The act of co-designing a wearable alarm was an act of love as well as a design challenge. Ultimately, we created a necklace-like piece with a (very loud) piezo-style buzzer that is triggered when the wearer closes the open circuit (located on the center midline of the necklace) with a metal ring. We used copper, but any metallic/conductive trigger would work.

Visit the tutorial for making your very own BEACON on Instructables. 

Read Edge of Urge's article on the BEACON