Researches Show How Hackers Can Spy With Your Headphones

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It's pretty incredible how a set of headphones or speakers can be used to spy on you and used to listen to you. They aren't microphones, but can be used as such with a lot of ingenuity and some math. 

This technique re-purposes the speakers in earbuds and headphones into microphones, capturing vibrations in the air and converting them into electromagnetic signals. This will then enable the hackers to quietly capture audio without the knowledge of the owner.

Source: Neowin