Some lines do, some lines do not. One of the interesting things to come out of this is this report of audio defense weapons. It seems that this was developed for the US Navy after the USS Cole incident and this 'Speaker' sends out a screeching noise of about 150BD.s or about one and a halp times the noise of a jet engine when standing beside it! I am sure that is quite painful. <G> I still would have liked to see them drop a couple of those old WWII ashcans over the side and see how high they could blow them!