Smart Jewelry

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Normally I'm skeptical of "smart" technology, but this high-tech panic button disguised as jewelry actually seems like a pretty good idea. My only concern is whether it's transmissions can be used to track you. That might not be the threat model this is meant to address, however. I imagine run of the mill attackers on the street aren't employing sophisticated signal tracking equipment, and the kind of people who do employ it are going to need something more than just a panic button to deal with.