Simplex 4903-9403 Category : Simplex The strobe on this alarm model isn’t directly connected to the alarm, oddly enough. Brand SimplexModel 4903-9403Manufacturer SimplexType Alarm (Horn/Strobe, 4-wire)
System Sensor MASS2415ADA Category : System SensorMASS stands for “Multi-Alert Sounder/Strobe.” As the name suggests, it can do more than one tone.
