Federal Signal 450D Simplex rebranded this alarm for a little while. Brand Federal SignalModel 450DManufacturer Federal SignalType Alarm (Horn)
Silent Knight PS-DATK Category : Silent KnightExactly the same as the Silent Knight PS-SATK, but just with the dual-action feature.
EST GCF-HDVM Category : EST/EdwardsThis is a ceiling-mount Genesis horn/strobe. I believe that I received this unit new.
Wheelock CH70-24MCW Category : WheelockThis is a very nice alarm. Since it is so quiet, it is great for testing purposes.