I have a new ultrasonic cleaner that I just put my Indians in after soaking in grape seed oil. Apparently, the high frequency is like kryptonite to my 13 year old daughters ears, and her pre-teen cousin, who is also a young lady. They begged me to turn it off before they fled upstairs. So I am checking on Amazon for a larger unit. Is that mean! Or just science. I think it is just science. It did not affect My treasure buddy grandson Connor at all. As Spock said on Star Trek "The needs of the may, outweigh the needs of the few."......................Sure got quiet downstairs. The cat left too!