flic outside my home office door to say "can i come in?"
homeworkers often do not want to be disturbed - maybe you are on an important call; maybe even on a video call.
flic on the outside of the office door, when pressed generates a discreet message to say "can I come in?" (maybe the kid is crying; maybe your partner has brought coffee)..
Then a red & green flic on the desk to reply yes / no