Smoke Detector, Hardwired Interconnected Smoke Detectors, Smoke Alarm with Replaceable 9V Battery, Interconnects Up to 12 Fire Alarms Smoke Detectors, Fire Alarm with Test/Silence Button, 1Pack

I purchased these to replace outdated alarms. I waited quite a while before I installed them. I searched videos and found one that showed me that I could keep existing hardwire connector. It fit buy the alarm continued to sound. I thought maybe I had an electrical problem, because we had another issue. Come to find out the new connector needed to be installed for it to function properly.Customer service tried helping me and even sent me new alarms because I tossed the connectors that came in the box.I felt that was incredibly generous considering that it was my error. Customer service at its best.The alarms were actually easy to install and if you have any problem the will trouble shoot with you.The alarms are very loud and again easy to install.

Work great came with back up batteries as well

These smoke detectors were not as easy to swap out as I had hoped. I was hoping that I would be able to use the same connector as what I had as they looked similar. No luck on that. I had to turn off the power at the breaker and swap out the wires for the new connectors. I had to drill out the plastic holes in the base plates to get the screws into the box. Once I got everything wired and plugged in, it was a little tricky getting the smoke detector to twist on to the base. The plug in was rubbing against the base and took some effort to get it securely attached. Once I accomplished that, I tested them and they worked. These are made for connectivity to each other so the if one goes off, they all go off if wired correctly for that purpose. Mine are and that worked. I haven't had any actual smoke to cause them to go off so I don't know for sure that they will work in an actual emergency. It does have a UL listed sticker on the back so hopefully it will work when needed. These are probably better than the 25 year old units they replaced.

Great product and great price.

Muy bueno! Todo como describen

This is only the second time i've needed to install smoke detectors in a home. The first time, I was a newer homeowner and "afraid" of doing wiring changes myself - so I bought detectors that were an exact match for what I was replacing, so that the current "plug attachment" that was in the ceiling matched. But now, i've learned it isn't really that hard at all to do to replace the wired harness.Obvious first step is to turn off the circuit breaker that powers the detectors. This was probably the most "annoying" part of the job - because it was on a circuit that didn't make really any sense and I had to try like 6 circuits until i found the right one. I confirmed I had the right one with a "non-contact" voltage tester.Then remove the old detector and mounting plate and that will give you access to the wiring. All you have to do is remove the current wiring nuts for the black, white and "communication" wire - which could be red or yellow. After that wire back in the new harness to the previous locations. I even re-used the original wire nuts.Be sure to install the included 9V battery - and a NOTE - there is a little packet of screws and drywall anchors in the batter compartment. At first I thought it was just some packing material for the battery compartment to hold down the "missing battery lever" that prevents closing the battery door.The only issue I experienced with the installation was that the mounting plate's holes design didn't perfectly match up with the currently installed electrical box, I got it to mount up - but with a bit of cross angle on the mounting screw.Testing after install, they all worked as intended. This was installed on my father-in-law's condo that we were getting ready to sell... and it passed the home inspector's testing, so that's proof they worked well and I installed correctly - LOL!

it chirps, which is what I expected

These work well and look clean on a white ceiling. Installed them all within a couple of hours, tested them, and they are plenty loud. Appreciated that they came with the 9 volt battery for each already. The only hiccup (and the reason for one star being knocked off) was they didn't come with twist wire connectors (you need 3 per unit) and we didn't have enough on-hand. Would be nice if they threw some of those into the package so we didn't need to go looking for more in order to install/connect them. Otherwise, these are a fine buy.