I am so glad I switched to the electronic doorknob.  The set up and installation on this device was so easy.  The instructions were clear and easy to read.  Programming the codes was easy too.  You can set up a code and delete codes very easily.  I absolutely love being able to enter a code to go inside my house, no in more fumbling for keys....the lighted display makes getting in at night so much easier.  I highly recommend, for the ease of setup, functionality and features.  You won't be disappointed!