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Wow, cool. Where did you get that? Does it also have other features such as allowing you to talk to the person in front of the door?

There are interfaces for most common door buzzer systems. I have mine linked to my FritzBox, super nice if you're taking a bath and someone rings...

My landlord already had it installed when I moved in, but yes, I can talk to the person at the door and press 9 to buzz them in.