Extension module for built-in loudspeakers Features: Up to twelve mechanical bell buttons can be connected. Additional bell buttons can be connected via additional extension modules. Up to eleven extension modules can be connected to a built-in loudspeaker. Alternating voltage query of the bell button connections to prevent oxidation on the button contacts. Small design. The connection terminals are protected against incorrect connection. The extension module is attached using screws or adhesive. Notes: Module for extending the built-in loudspeaker if more than eight mechanical bell buttons are to be connected. This component can be used to set up door communication systems with up to 140 audio participants (e.g. 1 x built-in loudspeaker, 11 x extension module for built-in loudspeaker, 136 x AP home station).
