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The Smoke Detector with built-in relay utilizes a photoelectric sensing method and is designed for use in commercial and residential applications. The device requires hard-wired 120VAC 60Hz power. The detector features two sets of dry alarm contacts: one form-A SPST and one form-C SPDT. The detector has tandem interconnect capability allowing up to 6 devices to be connected together. A 90dBA audible horn is included. The detector can be used with all Sensaphone models.