To use the video intercom functions, simply install the Classe 300 EOS, configure it and turn it on. To transfer calls to smartphones and access the functions from the Home + Security app, you must download the app (available for free on the Apple Store and Play Store), create an account or log in with an existing account and configure the app by following the instructions. To use the Amazon Alexa functions, you must set up an Amazon account by following the instructions.