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)
Federal Signal AV34+450D Category : Federal SignalThe AV34 light plate was made by Space Age Electronics and the 450D horn was made by Federal Signal.
