My smoke alarm has a steady green light, but every few minutes it flashes red. Is this correct? - Quora
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Kidde Firex Smoke Detector, Hardwired with nine-V Battery Backup & Front-Load Battery Door, Smoke Alarm, 4-Pack 21030967 - The Home Depot
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Kidde Part # 21029877 - Kidde Firex Smoke Detector, Hardwired With Battery Backup & Front-Load Battery Door, Smoke Alarm - Smoke Detectors - Home Depot Pro
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Inter-Connected (wireless online) Smoke Alarm with CE En 14604 - China Smoke Alarm, Alarms | Made-in-China.com
![Kidde Firex Smoke Detector, Hardwired with 9-Volt Battery Backup & Front Load Battery Door, Adapters Included, Smoke Alarm 21029886 - The Home Depot Kidde Firex Smoke Detector, Hardwired with 9-Volt Battery Backup & Front Load Battery Door, Adapters Included, Smoke Alarm 21029886 - The Home Depot](https://images.thdstatic.com/productImages/65a413c8-d974-400b-9d7a-9ad56bd27b6f/svn/kidde-hardwired-smoke-detectors-21029886-64_600.jpg)