ABB-Welcome Audio Extension Unit

The extension unit serves for connecting a maximum of 12 additional doorbell buttons to the audio integration unit. It extends the audio integration unit by a further 12 binary inputs for the integration into letter boxes and bell systems of different manufacturers. With interface for the connection of additional built-in keypad extensions. The built-in audio integration unit can be extended to a maximum of 99 inputs for doorbell push-switches with the aid of the built-in keypad extension.

NOTE: Connects to ABB-Welcome Audio Integration Unit (not included).