(This review was collected as part of a promotion.) This was by far the most easy electronic dead bolt i have ever installed! Not kidding a 10 year old could do it. It also fot on my pre existing door with out any extra drilling. There are numerous settings, way more then i needed. That was a huge plus. I think the only thing i would change is a little plate on top so people cant see you pushing your code in. A solid 4 out of 5 stars