With your own personal code, you can enter your home with just a few simple pushes of a button and lock it with just one. You also get more control over who has access to your home. Just assign a temporary code to who ever needs one and delete it when you see fit. Now you can totally eliminate the need for keys. SmartCode is easy to install, program and use and operates on 4 AA batteries. SmartCode complements any Kwikset knob, lever or handleset.