:focal(739x358:740x359)/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/8b/b2/8bb280ef-fc96-470f-9fb0-12ec75ec774b/roost-app-battery-smoke-alarm.jpg "This Smart Battery Sends a Message to Your Phone When Your Smoke Detector Sounds | Innovation| Smithsonian Magazine")
This Smart Battery Sends a Message to Your Phone When Your Smoke Detector Sounds | Innovation| Smithsonian Magazine
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