High-powered voice sounder designed for environments such as industrial applications, large open spaces, warehouses, factories and areas of public gathering or transit. 
 
Requiring no special wiring and retrofittable to existing installations. Fully synchronised, the units can be used as a replacement for electronic sounders or bells to broadcast a clear message for any situation - evacuation, chemical spills, lockdown, security or general information. 
 
Where staged alarm or phased evacuation is required message controllers can be used to allow up to seven different messages to be broadcast across multiple zones on just 2 wires.