Early warning: Photoelectric sensors identify developing smoke quickly to trigger an 85 dB siren at 3 m distance Long-term sensor: Each unit features an optical mechanism designed for 10 years of use, powered by an included replaceable 6F22 9 V battery lasting 1 year Home coverage: Four separate battery-powered units allow monitoring across multiple floors of your residence without requiring electrical mains wiring Silence mode: A dedicated button lets you lower sensitivity for 10 minutes during harmless cooking fumes and test device operation regularly Audible alerts: Distinct acoustic notifications warn when the power cell runs low or whenever technical malfunction occurs
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