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The normal human hearing range is between about 12 and 20 kHz, but beginning around age 8 this range begins to shrink, and adults can no longer hear sounds above a certain frequency level.

The Mosquito - Wikipedia

en.wikipedia.org/wiki/The_Mosquito

The Mosquito or Mosquito alarm is an electronic device used to deter loitering by young people by emitting sound at high frequency, in some versions so it can only ... They can leave the area when t...

Can You Hear This Sound That Only Young People Can Hear

www.buzzfeed.com/daves4/how-young-are-your-ears

Mar 2, 2015 ... Apparently, there's a noise that only people under 25 can hear. Can you hear it?..

Try It: Can You Hear These Sounds Only Young People Hear?

www.yahoo.com/health/try-it-can-you-hear-these-sounds-only-young-112627654778.html

Mar 3, 2015 ... There are sound frequencies that only young people can hear. Find out how old your hearing is.

www.ask.com/youtube?q=Sounds Only Kids Can Hear&v=VoFGKwZxT_o
Nov 21, 2009 ... This is the sound adults over 30 cannot hear.(some may not qualify)Enjoy!plz comment,rate and subscribe!
www.ask.com/youtube?q=Sounds Only Kids Can Hear&v=JO7vc0ERtyc
Feb 26, 2010 ... i tested this on my mom and she thought i was just trying o pull a prank on her prove her wrong and putt on a comment if you can hear it or not!!
www.ask.com/youtube?q=Sounds Only Kids Can Hear&v=g5hKGNqk0rc
Oct 28, 2011 ... there are some sounds that only young people can hear try to hear it and get ur parents to see if they can very interesting video.
www.ask.com/youtube?q=Sounds Only Kids Can Hear&v=Tcs4QJWO7QY
Apr 12, 2014 ... Teens, check if your parents can hear it... ... The Mosquito -Annoying Sound to make young people stop hanging out infront your property ...

Kids Be Gone: High Pitch Only Teens Can Hear Used As Deterrent ...

www.huffingtonpost.com/2008/04/23/high-pitch-only-teens-can_n_98304.html

Aug 21, 2009 ... The sound was coming from a wall-mounted box, but not everyone can hear it. The device, called the Mosquito, is audible only to teens and ...

Kid Annoyer - Android Apps on Google Play

play.google.com/store/apps/details?id=com.intaipei.zach.dogwhistlekidannoyer&hl=en

This app generates tones between 14,000 and 20,000 Hz, which are on the higher end of the ear's limitations. Generally only young people can hear these ...