After working all day and driving home, I just want to get inside my home and unwind. As I dig for my key, I realize that I can just use my master code and enter. So much easier indeed. Once inside, I notice the cleaning service came today and used the 'Alt' door code I provided for them so they may have in/out access to perform their job. (no keys needed) I change this code each time to provide added security between services. Once I lock the door for the night from the inside, I see a 'blinking red' light that lets me know the door is locked. Headed for secure sleep.