For integration into mailboxes and doorbell systems from various manufacturers, for example in products from Erwin Renz Metallwarenfabrik GmbH & Co KG, Boschstr. 3, 71737 Kirchberg/Murr. Enables audio communication. Built-in relay for operating the door opener. 8 inputs for connecting the doorbell buttons. Adjustable voice volume. With interface for connecting the built-in button extension. With interface for connecting the camera module. Consumption units: 2. Suitable for use with the camera interface (83327), the 180° camera module (83503) and the status module (83190). Further information on commissioning and operation can be found in the system manual and the online operating manual.