- Klaxon Signals, located in London, England, have manufactured Sound Signalling and Air Movement equipment for over 80 years. The company offers the Klaxon, Carters and Secomak sound signalling equipment, Vitavox loudspeakers and microphones, Secomak fans, blowers, heaters, air knives and shrink tunnels and Hanovia electric fan overdoor heaters.www.klaxonsignals.com