![First Alert Ac Hardwired Photoelectric Sensor Smoke Detector in the Smoke Detectors department at Lowes.com First Alert Ac Hardwired Photoelectric Sensor Smoke Detector in the Smoke Detectors department at Lowes.com](https://mobileimages.lowes.com/productimages/e1f17973-051b-4e24-93c4-791d5db383ec/05208284.jpg?size=pdhism)
First Alert Ac Hardwired Photoelectric Sensor Smoke Detector in the Smoke Detectors department at Lowes.com
![FIRST ALERT Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup, SA521CN-3ST , White - Smoke Detectors - Amazon.com FIRST ALERT Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup, SA521CN-3ST , White - Smoke Detectors - Amazon.com](https://m.media-amazon.com/images/I/71OKOvFmHyL.jpg)
FIRST ALERT Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup, SA521CN-3ST , White - Smoke Detectors - Amazon.com
![FIRST ALERT Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup, SA521CN-3ST , White - Smoke Detectors - Amazon.com FIRST ALERT Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup, SA521CN-3ST , White - Smoke Detectors - Amazon.com](https://m.media-amazon.com/images/I/41Vig1Xfe6L._AC_.jpg)
FIRST ALERT Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup, SA521CN-3ST , White - Smoke Detectors - Amazon.com
![First Alert Ac Hardwired Photoelectric Sensor Smoke Detector in the Smoke Detectors department at Lowes.com First Alert Ac Hardwired Photoelectric Sensor Smoke Detector in the Smoke Detectors department at Lowes.com](https://mobileimages.lowes.com/productimages/873f349f-e8c3-46fc-b85d-3ba34bcb7fdd/05208285.jpg?size=pdhism)