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The Informer100 is a Siren-like Speaker By Federal Signal..
On The FedSig Website it Says:
The Informer100 Speaker can be used as a notification device using tones and/or voice. Pair this model with a Federal Signal Commander system for additional capabilities; for instance, it can be equipped with up to four local alarm initiation devices to activate the unit locally and to activate the Commander controller for mass notification communications.