Carus IRIS audio door station, solid aluminum housing, hand-finished structural surface, for surface mounting, 1 chrome-plated and illuminated bell button, backlit name field, adjustable twilight sensor for controlling the lighting, based on TCS:BUS system, 3-wire technology required, permissible ambient temperature: -20 degrees C to 50 degrees C, color: aluminum, anodized silver, dimensions: H 240 mm x W 150 mm x D 27 mm