LRAD - Long Range Acoustic Device

[kach22i]

Long Range Acoustic Device
http://en.wikipedia.org/wiki/Long_Range_Acoustic_Device

According to the manufacturer's specifications, the equipment weighs 45 pounds (20 kg) and can emit sound in a 30° beam (only at high frequency, 2.5 kHz) from a device 83 centimetres (33 in) in diameter. At maximum level, it can emit a warning tone that is 146 dBSPL (1,000 W/m2) at 1 metre. The maximum usable design range extends to 300 metres. At 300 metres, the warning tone (measured) is less than 90 dB.

Sold to China?

On boats now?
http://www.w54.biz/showthread.php?331-Brown-Water-Navy/page2