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How to know if the power went out at home while you're away
Smart plugs, hubs and Wi-Fi sensors all fail for the same reason: they need the router that just died. What actually survives a blackout.
A power outage alarm for an elderly parent's home
They may not notice, may not call, and may not be able to fix it. How to be told instead — without cameras or monitoring them.
Freezer power failure alert: how not to lose a freezer full of food
A tripped breaker nobody notices costs more than the freezer. How long you really have, and why temperature alarms tell you too late.
Turning a drawer phone into a power-failure sensor
That old Android in your drawer can do one genuinely useful thing: notice the instant your power goes out — and tell you.