Im some kind of super hero...maybe?

I was at a house today doing some work, and I have this terrible, super high pitch ringing in my ears, and it must have shown on my face, because the homeowner asked if I was alright, I said I was hearing this shit, she said she didnt hear anything, then she said wait a minute... she disappeared for a sec, then the noise stopped. She came back and asked if I still hear it. I said no. Then she tells me she has this contraption that was installed by her landscapers that puts out a "hyper sonic squeal" to keep rodents away... Humans are not supposed to hear it. She said she has had it a few years, and she or anyone else she knows can hear it. She said she thought it probably didnt even work... WTF!?