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Kidde 21006378 is a wire-in smoke alarm powered by 120V AC with a 9V battery backup. This smoke alarm utilizes ionization sensing technology. Ionization alarms are effective at detecting invisible smoke particles from flaming fires.
This model is recommended for installation alongside photoelectric alarms for optimal fire detection within homes.
Was disconcerted to learn we'd purchased a discontinued Smoke Alarm. It was discontinued in 2019, but states a 10 yr. warranty, so we do have some life left in them. They're the same product we'd used for quite awhile and we had no issues with them, so trust these will be fine.
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