[Everything doTERRA] Cat deterrent: high pitched sound scaring people

The elderly in particular use a cat-deterrent in their garden. It is a
small apparatus with a speaker attached to it. It produces a
high-pitched bleep of more than a 100 decibel. The sound is mostly
only audible for children, youngsters and people with ears that are
still good. Many cat-deterrents use the same noise as the Mosquito.
The sound causes pain in the ears, headache, and ringing in the ears.
If you have any complaints consult your GP and make mention of it on
social media!

Working Mosquito: 17KHz-20KHz 90dB
Working Cat Deterrent/Animal Chaser: 16KHz-23KHz 130dB

http://www.hse.gov.uk/research/crr_pdf/2001/crr01343.pdf

http://www.icben.org/2014/papers/Team4/4_16%20MariUeda_1.pdf

http://www.mosquito.pieptonen.nl

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