Weird!  Didn't know when purchased! - this must be linked to Wi-Fi!  Tricky business and will not work at all without Wi-Fi - meaning no water period.  Needs 6 D cell batteries for power which means changing batteries when dead or no power.  Difficult to change them in a compartment mounted on the wall which must be removed to be opened UNDER THE SINK!  Also takes up a lot of room under the sink and makes it even more crowed since there is a garbage dissposal.  Seems like we made a big expensive mistake in getting this.