Testing the New Magic Item

"A sound that only children can hear? Is there such thing?"

Jewel asked something that we're all curious about. What about adults? Is there any effect on adult?

"You know how old people's hearing turned bad, right? That's because as you grow older, some of your senses will grow duller. Even people in their twenties could have worse hearing than teenagers just a few years younger than them. Though if they are perfectly healthy, even adult can have better hearing. And since these children are experimental subjects that have gotten their physical abilities reached it's maximum potential, their hearing should good enough. It's something I learned in the past," Victoria explained.

I see. As expected from a world which is more advanced than this.