Outdoor station in a compact design for surface mounting, metal housing made of robust solid aluminum, anodized natural, illuminated plastic bell buttons with integrated nameplate, maintenance-free contacts, long-lasting and energy-saving nameplate lighting, acknowledgement tone when the bell button is pressed, talk time ex works: 56 seconds, volume and microphone sensitivity can be adjusted manually, R terminal not provided, programming contacts can be reached without opening the device, door standby time (to control short-term storage in indoor stations), ex works: 56 seconds, speech connection only possible during door standby time, based on the TCS-BUS in 3-wire technology, permissible ambient temperature: -20 degrees C to 50 degrees C, IP42, housing dimensions: H: 139mm x W: 50mm x D: 16mm