I'm not sure what show it was on but, there was a house in Florida that was built to show how these products work. (It was in the past 6 months)
It showed how a sensor on the floor sends a signal to a control panel that shut the water off.
You will probably have to do a Google search to find it. Maybe under "water sensors" or "automatic water shut offs"?
I think it was on HGTV but, with Direct TV, I can't keep track of all the Home Improvement shows.
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