I bought this lock for our backdoor to help resolve a household conflict wherein I refuse to carry house keys but my husband and mother insist on locking the door. Conflict resolved! And not just resolved - I installed the app on my mother's Apple Watch and put it on the watch face and now she feels like an 80 year old tech guru because she can open the door with her watch. I still don't have to carry keys, my mother feels like the next Elon Musk, and the house is safely locked.