I'm confused as to when this saves water. Are people turning the hot water on, then going to make a cup of coffee, checking hacker news, etc, and then returning some 10 minutes later to finally shower? Or is it turning the water off for half a second when you reach over to grab the shampoo bottle?
Kind of comical that we need sensors to save us.
Moderating your water is a good idea. I habitually turn off the water while soaping. My little part.
Modernity is such a waste of the world, we take such things for granted.