Years ago when our kids were still in junior high and high school we decided to go to keyless entry as I was tired of getting called at work telling me "Mom, I can't find my keys or I lost my keys". After purchasing the first Kwikset Powerbolt keyless entry unit I would never be without it. All the door locks were replaced with these in short order. Gone are remembering to take your keys, finding lost keys, hiding keys somewhere in the yard.....it is a new freedom with the knowledge that my home is protected by a deadbolt yet easy enough for me to open with the touch of a few numbers and lock with the push of a button. I picked the shiney brass finish for the outside and the inside is a cream colored cover that actually matches the inside of my doors. The Powerbolt runs on four AA batteries which are easy to replace. When you hear your lock slowing down after inputting your code you know it's time to change the batteries. My husband had it installed in no time and it completely covered our old lock set opening in the door. All we had to do was come up with a combination of 4 to 8 numbers we could all agree on and remember as out combination. I just purchased a replacement unit after more than 10 years for the one we use the most so I am very satisfied with the reliability of this lock.