Photoelectric sensing: Responds swiftly to smoldering fires while reducing false alerts, powered by an optical unit engineered for a 10-year operational life Replaceable power: Supplied with a 6LR61 alkaline battery offering 5 years of service, so you only change it once during the 10-year sensor lifespan Acoustic alert: Emits an 85 dB siren at 3 m to wake you during an incident, complemented by a hush mode that pauses sensitivity for 10 minutes System verification: Dedicated test button allows routine monthly checks, while an audible warning signals when the battery runs low Ceiling placement: Covers 20 to 40 m² per unit on escape routes like hallways and stairs, with included mounting materials for both detectors
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