9v batteries that beep when you put them into the smoke detector
With a built in "low battery" feature so the smoke detector continues to beep and seconds later the battery itself is sync'd to beep. :::beep:::beep:::
Or hell, a NON-smoke detector that makes the chirp so you never actually find the source. Except it would only drive White people insane, so that's wrong.
OK OK, now this has actual potential: incorporate this chirp functionality into smartphone apps. For bonus points, hide it away in the standard advertisement-showing libraries apps use. Make smartphones hated again.
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