Door phone interface module in a DOMOS2 installation allow door opening and intercom from your home. Can control up to 3 doors in the same installation, if 3 door phone interface modules are installed. It is based on an 4+1-wire analogical system, which is connected to the Domos2 general line through 4 wires. 40410 door phone interface for analogue extension is compatible with 4+n conductor door phone systems (Tegui®, Guinaz®, Golmar®, Farfisa®, Auta®, Fermax®, Comelit®, Niessen®, Niessen Video® and Bticino®). Finish: aluminium.