Photo 1 of Ecoey Hardwired Smoke Detector Interconnectable UP to 12 Units, Smoke Detector 10 Year with Replaceable 9V Backup Battery, Fire Alarms Smoke Detectors with Photoelectric Sensor, 5 Packs

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Photo 1 of Ecoey Hardwired Smoke Detector Interconnectable UP to 12 Units, Smoke Detector 10 Year with Replaceable 9V Backup Battery, Fire Alarms Smoke Detectors with Photoelectric Sensor, 5 PacksPhoto 2 of Ecoey Hardwired Smoke Detector Interconnectable UP to 12 Units, Smoke Detector 10 Year with Replaceable 9V Backup Battery, Fire Alarms Smoke Detectors with Photoelectric Sensor, 5 PacksPhoto 3 of Ecoey Hardwired Smoke Detector Interconnectable UP to 12 Units, Smoke Detector 10 Year with Replaceable 9V Backup Battery, Fire Alarms Smoke Detectors with Photoelectric Sensor, 5 Packs