This sensor will alert you to a gas leak not only with a sound, but https://jiji.ug/cars/toyota-rav4-2019 also send a message to your smartphone. Sending notifications is a very important feature, this is where a really smart home shows itself as an extremely useful thing for many (well, and probably the case with a water leak sensor).

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An interesting sensor created in collaboration between MIJIA and Honeywell.