Simplex 2901-9806 Strobes such as the ADT B3409-024 were designed to be used with this horn. Brand SimplexModel 2901-9806Manufacturer Federal SignalType Alarm (Horn)
Simplex 4901-9811 Category : SimplexThis particular alarm is actually capable of doing three different tones.
FCI P24110-FC Category : FCIAlthough this alarm has 4 wire terminals, I believe that it is still a two-wire alarm. This alarm is part...
Couch F1-A Category : CouchUnlike my other F1-A, this one has a red handle and the hex lock on the front.