Yes that is right, but they are not addressable, they are just Smart Sync TrueAlerts, as they lack the majority of adressible features.
@FirealarmsNsirens, your options are obtaining a Simplex 4905-9938 Sync Module, (Preferred) or you can take the challenge and reverse engineer the Smartsync Protocol Yourself. (Not recommended if you don’t know much about electronics and programming.)
As for voltage, 24v into the module will do the job.