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The ELK-75 is a self-contained Voice Siren mounted in an attractive surface mount enclosure. The enclosure features the exclusive ELK "Echo" design in which the sound comes out around the back of the speaker and no holes are present on the front of the speaker enclosure. It produces high quality prerecorded voice messages along with loud siren sounds. ELK-75 Interior Voice Siren features English and / or Spanish. Will Drive Additional Speakers (ELK-70 or ELK-1RT)