Card to be inserted inside switchboard Art. 2906, (max 1 card per switchboard),allows the door entry phone service to be added, integrated with the telephoneservice in all the Simplebus systems, including the 'Bravo kit - Art. 8171 and8173' kit. Switchboard Art. 2906 is enriched with the following functions: Audiocommunication with door entry phone external unit, two separate Simplebusaddresses, controls to activate: door opener and gate opener. Remote activationof actuator devices, follow me over telephone network of door entry phone calls.