The Telecom Behnke 21-3113 is a function module for door entry stations of the Series 21, specifically designed for modular telecommunication systems. It features an integrated microphone and a single call button with an illuminated label field measuring 54 x 12 mm, positioned in the upper left corner. The front panel is made of aluminum in V2A design with a material thickness of 4 mm, ensuring a robust and aesthetically pleasing surface. The module includes a twist protection feature to ensure error-free installation into the door entry station. The silver design harmoniously fits into modern and classic building concepts. As a modular component, it enables flexible expansion and adaptation of door entry systems to individual requirements.