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a friend has a tricky noise problem

hello all,

a good friend is having a lot of trouble with a strange alarm that goes off at night. It goes off every so often at night, and it is a high-pitched whine which gets higher towards the end. It is making it hard to sleep. They live in what is otherwise a quiet neighborhood.

Only some of the neighbors can also hear it, and they can't tell where it is coming from.

Does anyone have ideas about how to isolate the source? Are there drones that can detect noises?

And what do people think it is most likely to be?

Thanks for all suggestions.

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