Wireless buzzer

Hi all,
Before trying to implement a certain solution myself I try to ask if anyone has already technically implemented the following:

  • Activate a wireless buzzer with a transmitter connected to my intercom which naturally emits a sound when the button at the door is pressed.
    Of course, there are already kits consisting of a button and wireless doorbell but I cannot replace the button since it is part of a block of doorbells in an apartment building.
    I don't expect any of you to make available to me the solution that he eventually created with his own skills.
    It would be enough for me to at least know if there is a solution that is not too exaggerated but requires an effort proportionate to the type of problem.
    Many thanks
    Luigi

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