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Apparently the package comes with 6 water sensors and a central hub that employs multiple notification methods if/when water is detected.
Interesting that the sensors apparently induce a signal into your home's electrical wiring to communicate with the hub. This lets the sensors operate on a watch battery for ~10 years. Wonder how well this works in the real world?
(Mod: donno if this is really the right section. Also, might we have a HomeKit section?)