I feel so much safer now with our new lock .Install instruction  were straight forward. We have a standard size steel door, My husband installed it and it  took about 45 minutes from old lock to new lock. It's a sleek design and it looks great on the door. So far so great. App works and commands work well through Alexa, The app is simple and easy to use also. I love everything about this smart lock and feel much safer in my home. I highly recommend it to anyone looking for added security,