I don't know, I just know that the whole Bell Center's employees has that kind of thing even Kirk Muller speaks into it. And no that thing is for 'after' braces, I'm 18 and I'm not even finish with my braces so I'm gonna have that thing at like 19-20... so its not a little teens thing. But, she is 14...
And I personally think she's pretty good for a 14 year old girl.
If you know that the anthem begins on a "LA" for example, well you search the "LA" cavity in that thing, you blew in it and it gives her the note she has to sing since it's "a cappella" without instrumentation, orchestra or anything.
It's really important to start on the right note 'cause as you have heard, those anthems have a wide range as far as low and high notes. If she starts the song too high, it will be impossible for her to reach some notes in the higher portion of it.