For integration into letterboxes and doorbell systems from various manufacturers, for example in products from Erwin Renz Metallwarenfabrik GmbH & Co KG, Boschstr. 3, 71737 Kirchberg/Murr. The cutout must be created by the manufacturer. Extends the built-in audio module with video functionality. Video camera with automatic day/night switching and infrared LEDs to illuminate night shots. Built-in heating to keep the lens fog-free. Horizontal/vertical detection angle: 170°/135° Consumption units: 4 For a video outdoor station, it is necessary to replace the base module 83140/xx with a new base button module 83140/xx-101. For an audio outdoor station, the existing base module 83140/xx can continue to be used.