I bought this when my son was born, with the idea that when my wife was carrying the baby in by herself she wouldn't have to search for keys in her purse. When first installed it took about a month to calibrate. And worked good for a few months. Then there was an app update and it just hasn't ever worked the same. Now we have to pull out our phones and open the app. Wait for it to find the lock and then push the unlock button. It will think for about 10 seconds then unlock the door. We loved it when it worked'm but at this point we went back to hard keys.