High-pitched beep solar garden guard gdimport. High beep from unit

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.
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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Why does the sound hurt people? As the influence of the noise on animals?Who can give me more information?
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