Thanks to its clear design language, the MIRO blends harmoniously into its surroundings. The completely smooth surface harmonizes with the soft shapes: the edges are rounded and the intuitively operated buttons are also round (door opener plus 3 buttons for operating additional functions such as stairwell lighting, opening side entrances, internal communication). The ideal combination of quality and practicality.Product features:Internal telephone MIRO Standard internal telephone with handset 4+n technology Ring tone volume adjustable in 3 levels Mute function with visual display Door opener button Additional buttons (potential-free) Technical data:Compatible with system 4+nDimensions: 90 x 200 x 52 mm Plastic ABS whiteInstallation instructions:Note: