https://www.cnbc.com/2017/09/21/amazon-alexa-smart-glasses-to-use-bone-conduction-not-headphones.html >The days of wearing headphones for listening could soon be gone, because Amazon's planned smart glasses are set to use bone conduction to transmit sound through your skull, according to a report. >Amazon's Alexa assistant is set to power its smart glasses, the FT reported, and wearers will be able to hear Alexa's responses to questions via their frames, transmitted through people's skulls.