Simplex 4903-9418 Category : Simplex The lack of TrueAlert branding on the front of the alarm, as well as the odd grille, are signs that this is an early version of the TrueAlert. Brand SimplexModel 4903-9481Manufacturer SimplexType Alarm (Speaker/Strobe, 4-Wire)
Gentex GMS24-15/75WR Category : GentexThe horn mechanism on this alarm is the exact same one as found on the rectangular electro-mechanical Simplex horn/strobes, such...
