[Neil]

Originally Posted by MargaretR

There has been a new development un the technology of the Mosquito teen repellet
The MOSQUITO - Ultrasonic Teenage Youth Deterrent, Teen Tormentor
At £400 a time they are beyond the reach of most BUT....

The noise has been made into a phone ringtone so that the little terrors can phone each other in class without teacher hearing.
Mosquito the Ultrasonic Youth deterrent for shops and homes Compound Security Systems News page

SO - it should be possible to download it to a PC and play it full blast without annoying neighbours

I thought some do gooders had decided these Mosquito devices were a breach of the childrens human rights