My daughter bought and installed this for me for my birthday, over a year ago, along with the Lever handle. As I have arthritis in both thumbs, this has been the best present I ever could have received! No more searching for my keys and the ease of punching in a code of my choice is the best ever invention! I am so impressed by this Smart Code Deadbolt, that I purchased one for my 82 year old mother and she loves it, too! So easy to unlock the front door and no more fumbling for the key. Adding the Lever Handle, has made this the best combo for my arthritis hands and even my husband loves the ease of unlocking and locking the door with just a push of a button! Love, love, love this and would highly recommend these products to anyone!