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> All of these technologies need at least 100 milliwatts of power to run continuously

But do they need to run continuously? To alert you to your fridge light being on a chip can be woken when the light comes on, sleep and wake every 30 seconds say, and sleep fully when the door is closed. Alerting you when you leave it open would be the only real use of power.

Having said that, I hate the idea as much as anyone else.



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