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This App Warns You if Someone Is Wearing Smart Glasses Nearby - 404media
(www.404media.co)
This is a most excellent place for technology news and articles.
yep, theres a few apps like that nowadays. Bluetooth is VERY vulnerable. At least from my understanding.
Bluetooth is a result of corporate, Microsoft types, giving a list of requirements. It's honestly amazing it sits on top of the 2.4GHz 802.11 standards.