I have2 smart code deadbolts and have had them for 6 years. 1 still works great and uses a set of batteries every year. The second has had 2 keypads for replacement and was using a set of batteries 2 - 3 times a year. About two years ago it stopped working totally. Now I just use is as a deadbolt. Over all 1 is excellent the other is unacceptable. Hence my average rating.