Were these some sort of deterrent? Or just an inadvertent hum from electronics t... | Hacker News

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		jjeaff on July 11, 2019 \| parent \| context \| favorite \| on: Sonic Devices Play High-Pitched Noises to Repel Te... Were these some sort of deterrent? Or just an inadvertent hum from electronics that were designed and QA'd by people who couldn't hear it?

tomcam on July 11, 2019 [–]

I believe it was a side effect of the alarm’s circuitry. No one ever gave me a sensible explanation.

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