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AP Explains: How Amazon Echo listens and what it stores
Published in 30-12-2016
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Authorities investigating the death of an Arkansas man found floating face-up in a hot tub believe that Amazon might have some evidence, given how Echo listens for commands and questions and communicates with Amazon's servers to respond. The software that powers it, Alexa, is constantly listening for commands such as a request to turn on the lights or play music, or questions such as what the weather's like. Though it's possible to do many of these tasks using a smartphone app, issuing a voice command keeps your hands free. Benton County Prosecuting Attorney Nathan Smith has said that he has no idea if the device recorded anything related to the death, but authorities want to check everything as part of their investigation. All voice assistants including Google's Assistant, Apple's Siri and Microsoft's Cortana communicate with company servers to process requests. Apple, for instance, insists that any communications are tied to a random identifier, not your Apple ID or anything personally identifiable. Google, on the other hand, ties everything to your account the company says it can offer a better, more personalized experience that way.

Reference: www.chron.com