"Steve Firth" wrote in message
.. .
ARWadsworth wrote:

http://www.diy-alarms.co.uk/catalog/...roducts_id=299

Call that a siren?

This is a siren:

http://www.youtube.com/watch?v=JEfYnByuTQ0

138dB and the loudest air raid siren ever made according to the web.

Adam