Federal Signal 450D Simplex rebranded this alarm for a little while. Brand Federal SignalModel 450DManufacturer Federal SignalType Alarm (Horn)
System Sensor MASS2415ADA Category : System SensorMASS stands for “Multi-Alert Sounder/Strobe.” As the name suggests, it can do more than one tone.
Simplex 4903-9217 Category : SimplexThis rectangular Simplex notification appliances has an electromechanical horn mechanism, rather than an electronic horn mechanism or a speaker.
