This low energy consumption is excellent. I'm an engineer, I've looked at all the details and I think it's really amazingly well done, !
Some PR: https://images.apple.com/environment/pdf/products/homepod/HomePod_PER_jan2018.pdf
Some PR: https://images.apple.com/environment/pdf/products/homepod/HomePod_PER_jan2018.pdf
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