When I received this, I read instructions and started to install. Was very surprised how quick and easy install went. This smart lock offers so many options, I can not believe how many. Great for when you leave the house and wonder if you locked it. Well just get on the app and check and if not you can lock from your phone. I also was surprised at the fact you can give a one time use code, so you can allow someone in for some purpose and then they can not use code and get in again. Comes with a key in case you forget code. I have already gone an gotten another one of these for my back door I like so well.