The best purchase I ever made. My wife is constantly locking the door, even if I go outside and without having my keys I could not re enter my home. This lock is easy to operate and the batteries lasted over a year. If I have guest arriving before I get home I can enter a temporary code and text the number to them when they arrive so they can enter my home. No more hiding a key somewhere worrying that someone might find it. I even used the smart key function to match my other kwikset door keys to this lock.