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For me, it's more like: * Install * Intend to set a calendar reminder * Wait 5 or 6 or maybe more or maybe fewer years * Live in dread for that 2am chirp

The "10-year integrated batteries" mean in exactly two years it will blast at 2 am for no reason. Then it will do it again a few more times until you finally throw it away because your heart can't handle it. Enshittification came for smoke alarms.

It's impressive how manufacturers have developed them to only chirp in the middle of the night during deep sleep cycles. How do they detect the alpha waves of the household so reliably?