On offer today we have a mains driven Kalxet, this is the short trumpet version and is very loud. We had great fun wiring this to the mains and terrifying the cat with it's strident shriek. A swft on off on the mains switch and we were transported into a WW2 submarine warfare film as we shouted DIve.... Dive.... Dive!. You could do this to perhaps wiothout the accomanying wifely moaning and nagging!!!!!!!