1 point
Many of them in a grid.
One microphone would be like having 1 ear. If you’ve ever known someone who is deaf in 1 ear, they have trouble locating the direction sounds come from. IIRC, the implementation involves something like ~50—100 or so microphones. If you have a lot of noise entering your house you can point the thing towards a window and it will generate a heat map image showing red color where the noise is the highest.
