Activate This ‘Bracelet of Silence,’ and Alexa Can’t Eavesdrop

Microphones and cameras lurk everywhere. You may want to slip on some privacy armor.

Last year, Ben Zhao decided to buy an Alexa-enabled Echo speaker for his Chicago home. Mr. Zhao just wanted a digital assistant to play music, but his wife, Heather Zheng, was not enthused. “She freaked out,” he said.

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