New (Free) Feature: Alexa Guard Home Security System

Post Updated: 6/28/19 - Last December Amazon announced the new Alexa Guard home security system feature on an invitation-only basis for US Alexa device owners, but it's now available as a standard feature for all US users. Note that since I'm US-based, I can't test or verify feature availability in other regions. What Is Alexa Guard? When enabled, Alexa Guard keeps Alexa's microphones turned on...