The TFS-Universal plus is simply installed in the housing of the existing door intercom or mailbox system. You can continue to use the existing bell buttons for signaling. This system also only requires an analogue extension port on the telephone system for communication.

• Ready-to-assemble plastic housing for screwing or gluing, microphone can be mounted separately
• Operation on an analogue extension port (a/b port) of a telephone system from Auerswald or other manufacturers
• Response sensitivity adjustable for loud or quiet interior spaces (e.g. workshop operation)
• Volume of the external speaker adjustable
• Programming of functions and dialled numbers via telephone
• Wear-free switching contacts for door opener, bell or light (bell transformer required)
• Additional switching options through optional a/b switching modules on the signal line
• Communication and switching also possible from outside, e.g. via mobile phone
• Letter signaling, new mail in the mailbox (mailbox contact required)
• Automatic door opening, e.g. automatic door opening during practice hours
• Bell stops after door is opened (door contact required)
• Door opening via bell button, quick opening without intercom
• Room listening/room monitoring (e.g. as a baby monitor), with dialling of a target number
• Operation as an indoor intercom, call acceptance and call termination via bell button