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Photoelectric Smoke Alarm for 120VAC/9VDC and 220VAC/9VDC Single or Multiple (Tandem) Station and Specialty Applications 120VAC and 220VAC photoelectric smoke alarm/detector with 9VDC battery back-up as an auxiliary power source in the event of an electrical failure. Features a warning signal for low or missing battery, and a dry-contact relay output suitable for use with any Geist Climate Monitor with analog inputs.