The Telecom Behnke module 21-2018 is a high-quality single-button module, specifically designed for use in professional telecommunications and alarm systems. It features an illuminated call button as well as an illuminated labeling field in the upper left corner, ensuring clear and visible identification – particularly advantageous in poorly lit or dark environments. The front panel is made of aluminum in V2A design, providing a robust, aesthetically pleasing, and corrosion-resistant surface. With a material thickness of 4 mm and dimensions of 90 x 90 mm (H x W), the module offers a stable mounting base and seamlessly integrates into standardized control panels or operator interfaces. An integrated anti-rotation feature ensures correct installation and prevents misalignment, enhancing installation efficiency and reliability.