9120B / SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack

Ordered this set to replace all my upstairs smoke detectors! They were pretty much newer versions of what I had, very simple install all function well as well! Great value and great quality from a trusted brand!

These are an excellent replacement for the original First Alert 9120B. I’m a single lady who owns a home I needed easy installation. I replaced two smoke detectors in 5 minutes. The prongs matched up perfectly and the mount was the perfect it. The battery was also included. No additional assembly was required. The mount and wiring is included, but I did not need them.

Good product. Works well

I need to replace the original smoke detectors. These replacement detectors were fairly easy to install and worked with the building system. They have been in use for about a 18 months. One unit has failed. It began beeping (full alarm) off and on for several days. I had an electrician check it out and it needed replacement. Overall, I am happy with the product. I expect 10 years of service so time will tell if this was a good purchase.

These were a replacement for the smoke detectors that were in our home. They were easy to install and come with replacement wires if one should need them. These are hard-wired to the wall and come with batteries used for backup.

As advertised.

These were replacements. Easy to install on existing brackets.

Shipped fast. I was concerned on the manufacture date of the detector and was surprised to see the recent date. These detectors work great.