Multi-Tone Sounder

This type of acoustic signal can provide between 2 and 64 selectable tones and offer  the ability to remotely switch between the different tones by means of a third wire.  This is important if the end user wishes to control different signals to convey different signals for personnel to take action if required.  For example: 1 tone could be used for evacuation purposes.  Another tone could be used to signal for all clear and a third could indicate a shift change.