![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/91jsvTmN9FL._CR3,0,1914,1080_SR684,386_.png)
FIRST ALERT Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup, SA521CN-3ST , White - Smoke Detectors - Amazon.com
![The house we recently moved into has smoke alarm bases but the alarm is absent. The manufacturer (Deta) say that new alarms do not fit old bases. I also think that these The house we recently moved into has smoke alarm bases but the alarm is absent. The manufacturer (Deta) say that new alarms do not fit old bases. I also think that these](https://preview.redd.it/the-house-we-recently-moved-into-has-smoke-alarm-bases-but-v0-cz6d2wo4sbyb1.jpg?auto=webp&s=c44f259af3938987aeff32cc33ce03ccd30705c7)
The house we recently moved into has smoke alarm bases but the alarm is absent. The manufacturer (Deta) say that new alarms do not fit old bases. I also think that these
![Kidde Wireless Smoke Detector, 10-Year Battery, Voice Alerts, Photoelectric Sensor Wire-Free Smoke Alarm - Amazon.com Kidde Wireless Smoke Detector, 10-Year Battery, Voice Alerts, Photoelectric Sensor Wire-Free Smoke Alarm - Amazon.com](https://m.media-amazon.com/images/I/716CAXxeYbL._AC_UF894,1000_QL80_.jpg)