Review on 🔥 SA521CN-3ST Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup - FIRST ALERT by Mike Woolford

I recently added a new room to my house and although I was able to add a wired smoke alarm to the room, I was able to not connect it to the rest of my house. I first installed a second sensor hardwired to the new room in the common area of the house so at least those two were connected and the smoke in the new room would alert the whole house. I wanted to completely fix the problem and update the system and these smoke alarms were the perfect solution. I replaced the 'new system' detector in the common area with the SA521CN and replaced one of the 'old system' detectors with the SA521CN, followed the instructions to wirelessly connect them and now both systems are fully connected. I've tested various detectors around the house and they all activate when one of them is triggered. Perfect solution for me; It would cost me hundreds of dollars to connect the two systems together.