I love this lock. I'm not the most skilled at installing things, but with the help of the  instructions and youtube how to video, I was able to get this installed without help. It has a keypad that you can  enter a code to unlock it without the hassle of trying to dig your keys out to unlock it.  It holds up to 30 different lock codes. Its handy for going out of town, giving the code to the person looking after my house, then simply deleting that code when I get back.