High-pitched Mosquito sound used in DC to drive loitering youth away

[Jenna]

Mike Gibson, whose company is the distributor for the Mosquito, said the device is particularly effective on youths ages 13 to 25, because that is the age at which humans can hear the highest pitches.
"When a youth hears the sound, they find it extremely annoying and will leave the area in a few minutes," he said. "The sound is benign, will not harm anyone, and is very effective in moving loiterers from an area."
But Transwestern said it has set its Mosquito at a pitch that can be heard by all ages, not one that targets teenagers in particular.
For anyone curious about whether their ears can hear the noise, there are samples of the sound at various pitches on the company's website, http://www.movingsoundtech.com.

More here: Anti-loitering 'Mosquito' debuts in D.C.; some find it a buzzkill - CNN.com

[Ducky]

Anyone who hasn't abused their hearing too much should be able to hear it. It's like fingernails on a chalkboard. Effective but they'll need to shield the speaker pretty good to keep the problem people from taking care of it.

[Reca]

I can hear them all. I actually have a pitch like this as my cell phone ring tone. Most people dont hear it ring but I can hear it just fine

[pgg]

I can't hear the 13-25 one thank god

[Jenna]

I can hear them all. I actually have a pitch like this as my cell phone ring tone. Most people dont hear it ring but I can hear it just fine

That's just because you're still an innocent child at heart!

[IMGreat101]

I can just make out the 15 KHz