Installation in a standard flush-mounted device box. Compatible with the Gira switch program TX_44 cover frames. Modular design allows for easy installation and expandability. Signal transmission and power supply for audio and video components via a polarity-safe and short-circuit-proof 2-wire bus. Expansion of the door station with an additional call button (up to 14 call buttons can be connected to one door station). Call button illumination in LED technology, light color white. The maintenance-free and energy-saving LED technology ensures uniform and well-visible illumination of the call button. Splash-proof call button cover made of impact-resistant plastic. Nameplate can be replaced without tools and without disassembling the frame. Professional labeling through the Gira labeling service or Gira labeling software. Main features: Transmission technology: Wired, Number of buttons: 1, Hands-free function: Yes, International Protection Class (IP Code): IP44, Operating temperature range: 25 - 70 °C, Product color: Aluminum, Keyboard illumination: Yes, Outdoor unit power supply: AC/DC, Delivery contents: Indoor unit included: No, Including outdoor unit: Yes.