I can honestly say that don’t know what happens when the power is lost. The sensor is battery operated. However, if / when that power goes out, I care more about the things in my refrigerator and freezer than I do about the lawn watering...
All technology has its faults. I use this for what I can learn and help me to get the best use of the water that I use. It is not for everyone, but if you enjoy knowing, it MAY be a consideration.
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