Simplex 4903-9217 Category : Simplex This rectangular Simplex notification appliances has an electromechanical horn mechanism, rather than an electronic horn mechanism or a speaker. Brand SimplexModel 4903-9217Manufacturer SimplexType Alarm (Horn/Strobe, 4-wire)
Simplex 4903-9417 Category : SimplexThis is a SmartSync TrueAlert which I am able to use with my Simplex 4010.
Space Age AV32+2DCD Category : Space Age ElectronicsThat is an electromechanical horn on the rear of the strobe plate.
Amseco SSS2-75110 Category : AmsecoThe strobe part of this alarm is actually just placed over what could serve as a stand-alone speaker.
