The Doorline 150805 Classic Intercom System transforms existing telephones or smartphones into an intercom. It allows door conversations directly on the phone and can be expanded into a video system with an IP camera. Installation is straightforward and can be done retroactively with just two wires for power and telephone line. The timeless design in anthracite offers both horizontal and vertical mounting options, as well as a backlit text field. It operates without an internet connection and subscription fees.