General
Housing material	V2A stainless steel
Colour	Silver
Module type	Microphone-speaker module (MLM)
Function	Emergency call with pictogram
Connection	Only for lift emergency telephone
Accessories	Patch cable 20-9309 required
Construction type	Front installation
Plant construction type	Modular

The function module of the series 21 from Telecom Behnke serves as a microphone-speaker module (MLM) for door intercom stations in the field of elevator emergency call technology. It is specifically designed for front mounting and features an emergency call button with a pictogram displaying the bell symbol for an elevator emergency call. The module is made of V2A stainless steel, ensuring high corrosion resistance and mechanical strength. It is designed without integrated electronics and can therefore only be connected to an existing elevator emergency call telephone.

Microphone-Speaker Module
The module combines a microphone and a speaker in a single housing, enabling bidirectional communication between the user in the elevator and the responsible emergency call center. The positioning of the microphone at the bottom edge and the emergency call button at the top edge ensures intuitive operation. The emergency call button is marked with a pictogram showing the bell symbol to clearly indicate its function. The module is designed for use in elevator installations, where fast and reliable communication is required in emergencies.

Housing and Material
The housing is made of V2A stainless steel, a non-rusting steel with high strength and resistance to external influences such as moisture, salt, or mechanical stress. The surface is silver-colored, giving the module a professional appearance. The front-mounting design allows for clean integration into existing door intercom stations of series 21. The module is modular in construction, allowing for flexible expansion of the system.

Connection and Compatibility
The module does not contain any electronics and is therefore not suitable for independent operation. It can only be connected to an elevator emergency call telephone that provides the necessary power supply and signal processing. Compatibility is limited to series 21 from Telecom Behnke, with the modular design enabling expansion of existing installations.

Operation and Function
In operation, the module serves as an interface between the user in the elevator and the emergency call center. When the emergency call button is pressed, a connection is established, allowing the user to describe their location and the emergency situation via the integrated microphone. The speaker enables the center to directly address the user. The emergency call button illumination is optional and can be activated depending on the system configuration to improve visibility in dark or poorly lit environments.

Applications
The module is intended for use in elevator installations, particularly in buildings where an emergency call connection is required in case of failure or entrapment. It is suitable for public buildings, residential and office complexes, as well as industrial facilities where safety regulations require functional emergency call technology. The robust stainless steel construction also makes it suitable for use in damp or harsh environments.

Accessories and Connection
It serves as a connecting element between the module and the elevator emergency call telephone. Installation is carried out by front mounting into the existing door intercom station of series 21, with exact mounting instructions to be obtained from the respective system provider or installation documentation.

Advantages in Operation
The modular design allows for flexible expansion of existing installations without requiring a complete reinstallation. The use of stainless steel ensures long service life and high reliability under various environmental conditions. The clear marking of the emergency call button with a pictogram ensures intuitive operation, even for users unfamiliar with the technology. Integration into existing series 21 systems reduces installation costs and simplifies maintenance.