If you want to switch on lights or control your existing doorbell at the same time by pressing a (bell) button,
then you need additional switching contacts. Auerswald offers an exclusive solution for the TFS-Dialog 200 a/b switching modules,
which can be easily connected anywhere on the signal line between the door intercom system and the telephone system
and trigger the switching process when a button is pressed.

Six of these a/b switching modules can be used on a TFS-Dialog 200 door station, and yet only one
A single, two-wire cable is required. Each button on the door station can be assigned to one or more switching modules
The modules fit easily into existing flush-mounted boxes, for example.