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When pressing the doorbell with the simple, other functions are to be activated, an a/b switch module suitable for TFS-Dialog 200, TFS-Dialog 300 and TFS-Universal plus paid: It ensures that at the same time, for example, the corridor light is switched on or the existing doorbell is controlled. The modules are simply anywhere on the signal line between tursprechstation and a/b port of the telephone system. When you press the doorbell button is a special control signal is generated, the switching process is triggered. Speak with the visitor at the door, the door opener is actuated by pressing a number key. If several a/b switching modules can be installed, it can be used through specific control with different frequencies different switching operations. Six of these a/b switching modules can be used on a door station TFS-Dialog 200/300, yet only one, two-wire cable is required. Every key of the door station can be freely selectable assignment one or more switch module control. The modules fit easily into, for example, the existing flush-mounted sockets.Communication and switch via mobile phoneSuppose you are only briefly because of an errand go: when the door ringing on your own mobile phone redirected, you can tell the person in front of the door when turgesprach you to back at home, or the mail carrier explain, with whom he should deliver the package. It is a member of the family, which has forgotten the key, a mobile phone. Even the door is opened, the light is switched on or a different switching task via the connected a/b switching modules can be controlled!This text is machine translated.