FCI HEF/STW Category : FCI This is a multi-tone alarm. Unfortunately, the strobe was DOA, but it is the same as the strobe on the FCI STW-4F. Brand FCIModel HEF/STWManufacturer FaradayType Alarm (Horn/Strobe)
GE 521BXT Category : GEI think that this smoke detector might be intended for use in security systems.
Simplex 4904-9139 Category : SimplexI believe that this strobe plate was designed to be used with bells, such as the Simplex 2901-9333.
