Simplex 4903-9238 Category : Simplex This unit has an electronic horn, as opposed to the speaker or electromechanical horn found in other rectangular Simplex notification appliances. Brand SimplexModel 4903-9238Manufacturer SimplexType Alarm (Horn/Strobe, 4-wire)
Cerberus Pyrotronics S17-FS Category : Cerberus PyrotronicsThis is an interesting strobe because it is single gang (half the width of a normal alarm).
Federal Signal 950B Category : Federal SignalI’m not sure why there is a transformer on the side of this alarm.
