The Kidde i9010 (Model 21009992) is a 10-year sealed lithium battery-operated ionization smoke alarm designed for easy installation and long-term reliability. This unit features a maintenance-free 10-year battery that eliminates the need for battery replacements and prevents unauthorized deactivation. It utilizes ionization sensing technology to detect invisible fire particles associated with fast-flaming fires. Key features include a Hush button to quickly silence nuisance alarms, a test/reset button to ensure proper circuitry operation, and an end-of-life chirp that indicates when it is time to replace the entire unit after a decade of use

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