With an output at 1m in excess of 140dB the A141 high output disaster siren and alarm is louder than a jet engine on full power at takeoff. With a 400W power it offers an effective warning range of between 500 and 750m depending on the atmospheric conditions. The unit has a choice of 32 user selectable warning tones and with second and third stage alarm capability, suited for use in quarries, on large industrial and petrochemical sites etc. It generates multiple internationally recognised alarm tones including fire, security, civil defence, alert, COMAH (SEVESO II) toxic gas alarms and disaster warnings for flood, tsunami, tornado and other severe bad weather conditions. It is powered from either 24VDC or 115/230VAC. The mains-powered versions can be fitted with battery backup; AC power and battery voltage can be remotely monitored for potential faults. Radio control capability, utilising secure telemetry for additional security, isavailable to enable wire-free installation on large sites. The devices are lightweight, require no maintenance and offer reliability, low energy consumption and long life.