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by will_hughes 3105 days ago
I've found that particularly high pitched sounds can bounce of hard/flat surfaces very well.
1 comments

It is possible to find it with a bit of hardware like a microphone. Very easily by taking multiple level measurement and some multilateration.

It gets hard when there is more than one.

The problem with identifying it by ear is that you get already some 20-30 cm precision at best unless you've trained in echolocation like some blind people. For such a small device it could well be a whole room.