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an anti-mosquito device passed by the FCC isn't reason to go trapsing onto other people's property to destroy things

According to this report on the mosquito device and hearing aids, the mosquito emits a 17.8khz tone. That's one sine tone. Which is [well] above the average hearing threshold of a 30 year old.

This noise device uses very high frequency sound. It will be my it's nature short ranged. How close do they have to be to his property for it to be a problem?

The product page touts itself as effective for "between fifteen and twenty meters" That's roughly 45-60 feet. If I had one of those on my porch it would definately affect both of my neighbors as well as anyone on the side walk in front of my house or in the steet.

the piezo wafer is positioned directly behind the opening of the (tweeter) horn. I'd bet a prolonged burst from one of the bigger models from http://www.wickedlasers.com/ would crack/fuse the transducer. It would be simple to shield from such attacks, but the model picutred at http://www.compoundsecurity.co.uk/teenage_control_ products.html seems to have no such shielding.

oh, and make sure to wear goggles. Those things are VERY VERY bright.

Could be as effective as a .22 round applied in the same manor, but significantly less likely to get you thrown in prison.

according to the FAQs
"The effective range is between 15 and 20 metres. " = That's 65 feet

That's a pretty long distance in the majority of US neighborhoods.

From reading the website and the $937 price (UK£ 495) it's pretty obvious it's not designed for individuals looking to annoy your neighbors. It does effect your neighbors rather than just their children since the page says "the majority of people over the age of 25, have lost the ability to hear at this frequency range" so if you have any neighbors under 25 you're bugging the crap out of them.

I think I'd contact the website and explain to them that you're a early 20s home owner and your elderly neighbor is trying to run you out of your house. I'd also print out the webpage and show it to the police, maybe you just need to have a younger police officer come out to the house?

While searching information on the Mosquito I found this interesting: teenagers are actually using it as a ringtone in schools because teachers can't hear it.

"...maybe because he can't HEAR it he doesn't know there is a problem?"

According to the products page, the purpose of the Mosquito is to drive teenagers away from an area by producing high frequency sound only they can hear. Older people cannot hear it. The device has no other purpose, and is certainly not a mosquito repellent device as some posters have assumed.

Try reading the article first, the device has nothing whatsoever to do with insects, besides the name.

This is one of those time a civil lawsuit is probably in order. The illegal device the old person bought is specifically designed to annoy young people by way of emitting ultra-sonic (to old people) sounds that, well, annoy young people. Take lots of pictures of the device on the old person's property, turned on and set to do its deed. Get young witnesses to sign affidavits attesting to the audible and annoying nature of the sound. Then all you have to do is also enter all of the product literature for this particular device into the court record. Since this device is specifically designed for one purpose -- to annoy young people -- and its sound emissions do not stay on the property of the old owner, the old owner is certainly responsible for what it is doing to the young people's enjoyment of their own private property and any adjoining public property.

Of course, first sending a very gracious but firm certified letter asking for the removal of the nuisance can only help your side look good and reasonable.

Except in the UK the council puts them up.
http://www.compoundsecurity.co.uk/deterrent_news_8 5.html

Don't they have mall cops in the UK?