This Kidde Detect smoke alarm 3-pack (Model 20SD10) features advanced photoelectric sensing technology to detect visible fire particles from smoldering fires faster than standard alarms. Each unit is powered by a sealed lithium battery that provides 10 years of continuous protection without the need for battery replacements. The design includes enhanced sensing technology to reduce nuisance alarms from cooking steam, a loud 85-decibel siren, and a red LED visual indicator. This pack is designed for easy installation with an included twist-and-click mounting bracket and meets UL 217 9th Edition safety standards

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