You know, there's an alternative to high-frequency sonic warfare: lower frequency sonic warfare.

Teenagers famously like their own sort of music, and detest that which their parents like. So, if you play music of the sort teens loath, pretty soon you don't have a problem with teens lurking about anymore. Frank Sinatra and his ilk works best, I'm told.

We are, we are... I think it's neat, going into Audacity and making a modulating annoying-as-all-get-out frequency that only the kids can hear. As for the military aspect, imagine using this with that (I don't even know what it's called) long range sound "gun" that sounds normal near the speakers, but loud as all-get-out at the target. Something the coast guard was interested in... shomshing in the news several years back... Now if Newegg would just sell the portable version, old men could torment from afar with glee.

A couple of weeks ago the missus was teaching a bunch of kids about sound. Part of this was discussing what frequencies people could hear. At one point one of the girls got out her cellphone and demonstrated the "Mosquito" ring tone.

There has to be a carrier. Mosquitos do lay eggs in water, but it is a large pond. See, Americans are not to blame for all of this world's problems. But it is useless to try to talk sense to dogmatic fleabane Publicaria dissenterica of Europe, even when they're right. So, some (UK?) company must've licenced the patented bug-brain technology to “Kidszzz Be Gone". Even so, these buzz boxes had better be built like aircraft "black boxes," because, our yoofs tend to pack and be strapped. Thanks for the buzz.

I'm 33 and I can hear it.
Not so much a mosquito as the sound of a dentist's drill to me.

Mosquito illegal, waterboarding ok, seems logical enough.

I'm the same age as Jason, above, and I too can hear it. Can you hear your tv when it is in stand by mode? How about fluorescent bulbs. Ultra-sonic ring cleaners make me want to puke. Most spinning hard-drives irritate me. Basically, the only time I don't feel like someone is hissing or super faintly whispering in my ears is when I am in the forest. The moment businesses start using these is the moment they will lose more than they gain.