First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack

These fire alarms were very easy to install and work well.

Easy to install with pre-installed electrical wiring.

Smoke alarms have a 10 year life span I purchased these to replace existing devices and they work perfectly,

The delivery was overnight and what a relief. These smoke detectors were spot on. We had our former smoke detectors for over 20 years and thought maintenance meant changing the battery and vacuuming any exterior dust particles. Nope, it means one should replace it at least every 15 years. HD and many hardware stores can't stock all the various types of smoke detectors. I looked up the original product number on the old smoke alarm and it was a perfect match. The only item that had to be changed was the base of the unit didn't match the previous one. Everything else worked perfectly. 1. Don't use a regular 9 volt, we purchased the Eveready long life and they generally last 5 years. Date the battery before you place it in the detector. 2. Date your detector on the outside, so you know when to replace it. 3. If you have a detector that is older than 10 years, definitely replace it. The MFG warranties it for 10 years. After that you are on your own. 4. When the weather changes for the winter, that is when the batteries and the back up system will blow in the middle of the night, generally after 430am. The price was right, 6 alarms for a little over $100 with shipping and tax. Do yourself a favor and replace the alarm after 10 years. The alarm company told me this or I would have just changed the battery and had the alarm go off again.

Go figure, in my 20 year-old home the smoke detectors have neved been changed, so i ourchased these as a set beciase individually i have spent three times a much. They come with a 9v battery installed, have a wire harness, and dust condoms to cover them if youre doing construction work. Install was easy, and i have mine wires in series to ensure the whole home is alerted if theres a fire. If your detectors are more than 10 years, replace rhem. Its easy to do, so save some cash by buying in bulk and installing them yourself. Peace of mind is worth the time and price.

Easy to install, very loud alarm, and even came with the backup 9v batteries as well as a wiring harness for older plug-ins (which we needed). Thankfully we have not had a fire yet so I can't say weather or not they will work in a fire but I have faith in the brand and that they will work. They are easy to test.

I ordered these to replace my smoke detectors that were over 10 years old. Very easy to install.

Replacing 20 year old original alarms with these. Connects to my existing wiring, so I didn’t need to use the wiring that came with it. I was hoping these would attach to the same mounting bracket I already had since they’re the same brand, but they don’t. Not a big deal and actually helpful since they’re slightly wider than the old ones and covered the old paint the painters didn’t get covered around it. All I had to do was loosen the screws, twist the old mounting bracket out and put the new one on in reverse order. Easy. I was surprised these came with the backup battery already installed, so now I can return the pack of batteries I bought. Just pull the tab out and they’re activated. Comes with a dust cover I guess if these are installed during construction to keep them protected from dust. I wouldn’t use it to paint over, because it won’t cover the bracket. I would recommend these from this well-known brand.