Copied from somewhere:
I was sent these links, believed to be the sonic weapon which the government was going to deploy during the 428 BERSIH 3.0 rally. Not only can it impair your hearing permanently, the high frequency can even rattle your eyeballs till they fall out.
The research and development of the weapon has been on going locally. Here’s another prototype:
(Oops, did I get the correct links?)