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The Kidde P3010L worry-free living area sealed lithium battery power smoke alarm incorporates Hush™ feature to quickly silence nuisance alarms. It features advanced photoelectric sensor that detects visible particles quicker and red LED that flashes along with the alarm sound. This smoke alarm has test/hush button that tests alarm circuitry and activates Hush features. It alerts end of life for every 30 sec to indicate when the unit needs replacement.