It is not often that I write reviews. But I want to mention that I feel that the Kwikset 99390-001 Halo Wi-Fi Smart Lock is one of the best devices I have ever bought. Installation was easier, but getting the code to activate the app was tricky. I tried sending the code to my Hotmail account about 6 times, but for some reason, I never got the code. When I tried Gmail account, I got it the very first time. One thing I like the most about the lock is that I was able to set up the Auto-Lock feature which locks the lock after 5 mins. Auto Lock delay can be set for 30 Seconds, 1, 3, 5 or 10 minutes. No more finding an unlocked door in the morning. Now I feel very safe. This will help keep the house secure. The app also allows to add 250 users with different codes and 10 members of admins that can use their phones to open the door. It also alerts you. Basically, the lock can be opened using the key, code or phone. The phone also works as lock as you have a network connection. I We have been using it 3 days now, 40 times a day (there are 6 of us at home) and the battery is still showing 100%. I love it and highly recommend this lock.