AP home station, matt grey (painted) System 55 - Control buttons with integrated LEDs for status display. The control buttons on the AP home station control the following functions in conjunction with the switching actuator or the flush-mounted switching actuator: - Switching lights and other functions. - Controlling the door opener. - Setting the ring tone melody. - Switching the ring tone on and off. - Answering calls. - Activating the enforcement function. - Setting the ring tone and speech volume. This component makes it possible to set up door communication systems with up to 70 participants (e.g. 1 x built-in loudspeaker, 5 x extension module for built-in loudspeaker, 68 x AP home station).