They only work where you can hear them ... you need to build an Internet-connected smoke alarm. Smoke alarms, or at least ionization-based alarms with a tiny amount of radioactive americium ...

Ionization smoke alarms work best on fires with active flames, also called “flaming fires,” McKelvey says. These can be from flammable liquids, paper or wood, and may have less smoke than flames.

Q: About 10 years ago, I replaced the original wired smoke alarms in my home with wired dual sensors that use both photoelectric and ionization technology. Because I’ve read that in-home smoke ...