Simplex 4903-9219 Category : Simplex This rectangular Simplex notification appliances has an electromechanical horn mechanism, rather than a speaker or an electromechanical horn mechanism. Brand SimplexModel 4903-9219Manufacturer SimplexType Alarm (Horn/Strobe, 4-wire)
Aames NC-S1 Category : AamesWhen the glass breaks, the button behind it gets released, which in turn triggers the alarm. No documentation available.
Siemens U-MHST-MCS Category : SiemensI believe that this alarm has the ability to produce multiple tones.
