Apartment intercom WF 26 with gong call, with dynamic microphone loudspeaker for speech communication, gong call and floor call, surface button for voice change and opening function, dimensions: W 85 x H 145 x D 30 mm, installation on switch box or on the surface (the brackets are then removed), circuit diagram, for systems with the power supply unit/amplifier TV20/S + mains transformer and door station LE/B
