Wireless door intercom receives radio signal when visitor pushes radio transmission button outside house and connection is set-up to mobile telephone of house owner

摘要

The door intercom includes a transmitter (1) inside the house having a signal reception unit and a call unit (2). The signal reception unit receives the radio signal from a radio transmission button (31) of the door station (3) outside the house. The radio signal is received by the transmitter when a visitor pushes the radio transmission button. A connection is set-up by the call unit with the mobile telephone (4) of the house owner, who is not present in the house. The owner of the house can have a conversion with the visitor using bidirectional long-distance radio transmission.