BEACON Self-Defense Necklace
For me, living in NYC means that my nightly commute between the train and my apartment is often fraught with concern for my safety.
I designed a wearable tech piece with a piezo buzzer and conductive tape that sets off an alarm when the wearer triggers the alarm by closing the circuit with a copper ring; 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.