Absolutely love this lock!!! First it was super easy to install, only took a few minutes to install. The app was super easy too!!!  You can select different settings for the lock, you can choose a code that will work like monday to friday, that will work for a one time use. It even has a safety feature that when when some one puts their hand on screen that only 2 numbers appear. You have to touch those numbers in numerical order to get to full number screen. The app let's you know when someone unlocks or locks the lock. This is truly a fabulous lock!!