Duo System is the new Aci Farfisa philosophy of digital system, for a practical and fast videointercom installation, that allows to cut strongly time and costs. A new technology that simplifies the videointercom systems of medium size, today with Duo System only 2 non-polarised wires are enough to make easily even complex installations. Video and audio signals, opening door lock service and the controls of various functions stay only on 2 non-polarised wires, simplifying the system and improving the quality. Duo System technology exploits the elegant and innovative aesthetics of Matrix range with modules for conventional or digital push button panels. It is possible to install max. 4 door stations in parallel and 40 internal stations also with intercommunicating service. For the internal stations, Compact or Project videointercom line can be chosen, both perfectly integrate, with style and advanced performances in every type of environment. Compact and Project monitors respectively have one and five additional buttons where it is possible to program the direct turn on of cameras or intercommunicating service with other monitors or intercoms. Call from landing is available. The wiring is easier, the time of carrying out is shorter, for a great decreasing in installation costs. At the moment the products stay at the last step of planning procedures, therefore the items will be available in the market starting from April/May 2005.