Attempted to add to door and the mechanism did not engage no matter what I did, I did hear the motor but no engagement, the programming is ridiculous..had to return.We picked this for the ease of use, there was a physical key option, and it didn't require wifi. However, that means you have to manually set any codes on the lock. The process is pretty simple. We like the auto lock feature once you close the door after entering! Installation was easy as well, but know you need to use a usb battery/charger to prep the lock for install, this wasn't called out in the directions.The lock was easy to install and looks great. The lock however only unlocks I cannot get it to relock. I can hear it trying to lock but it doesn't.Is hard to understand the instructions. The automatic self lock never worked I spent around 3 hours trying to program the automatic self lock I never make it work I follow every single instruction on the manual, every code I never make it work. And that was one of the main reason why I buy this lock. I was tired to deal with it and I never bother to send it back. The other features it work good.Looks good, price is right, but save yourself time and frustration. The instructions were in English, but not in any form anyone can recognize. My contractor looked at the locks I purchased, showed me in multiple sections how the instructions contradicted themselves or didn’t make sense, and politely refused to install them. He wasn’t being rude, but his professional integrity would be affected by the performance of anything he installed. I understood, but wanted to save money and decided I would install them myself. I contacted the manufacturer, Probico with no help, and after multiple days of frustration, I took them time to un-install all of these, pack them up, and take them to UPS to send them back. It was worth it. Found some super cute locks by hugolog on amazon that have a PROFESSIONAL downloadable PDF of clear instructions as well as great customer service.The programming compared to other locks we own is very complicated. Many steps to go through. Also, wish the user codes were only 4 digits instead of 6.Came with no instructions, thus uselessLove how easy it was to install and works perfect !! No need to have to have your keys out anymore :)