Kidde 21007624 AC Photoelectric Smoke and Carbon Monoxide Detector Alarm | Hardwired with Battery Backup | Model # KN-COPE-IC

This was a direct replacement for an older one. The connector was a little different but an adapter was provided. Batteries are included. The base was exactly the same so I didn't need to change it. It took about 2 minutes to figure out and change. The old one lasted about 12 years and never had the backup battery changed.

Used same mount and wiring as one that was installed and hardwired as a set back in 2015 and I didn't want to have to fight with compatibility or replacing all of them to match.Worked perfectly the first time.

The product is accurately described, exactly what I needed and easy to install.

Simple to install. Good price. I went between this and the photoelectric/CO detector combo by First Alert (https://smile.amazon.com/gp/product/B002UQW8OS/ref=ox_sc_sfl_title_4?ie=UTF8&psc=1&smid=ATVPDKIKX0DER) but the price is about $10 cheaper for Kidde. I installed two of these in a condo for my father-in-law. Installation was easy. There were 15 year old Firex (FADC #5000) in there previously but the rewiring is simple. I didn't bother paying $4.50 per adapter to avoid having to rewire it since it is so easy to do.The rewire takes 2 minutes just make sure you turn off the circuit that has the alarms on it. I didn't bother doing that a few years back when changing out 10 alarms in our home but got a few small zaps. Take out the two screws that held in the mount to the ceiling, remove the twist caps on the red (was a yellow wire on the Firex and this is used for interconnectivity between wired alarms), neutral, and hot, and replace the wires with the new Kidde. After wiring is complete put the new mount on and plug in the wired adapter to the alarm. The hardest part of the hole thing is getting the alarm to properly screw onto the mount but that's a problem with all of them.It's loud, it interconnects. It speaks to you telling you if it is a CO issue or smoke. I hope I never have to hear it other than testing regularly.

Luckily it was a replacement device, and the correct wiring harness was already installed in the wall mount.

I needed to replace a fire/carbon monoxide alarm. To be sure I had the correct one, I just put in the serial number and it was a perfect match. It’s hard to do that in a store. Amazon made it easy.

The first one malfunctioned and they rushed out a replacement.

In March 2014 I replaced my 10-year old Kidde units (PI 2000 and KN-COSM-IB) with the newer versions (PI 2010 & KN-COPE-I AC respectively) - as suggested by Kidde support when questioned about appropriate replacements.I had no issues at all with the old ones in ten years, but about 4 months after installation at least one of the new KN-COPE-I AC models has become a nightmare - with 3-8 false alarms per day starting suddenly about a week ago - in late June 2014. No smoking, no cooking, no other potential red herrings- just completely unjustified false alarms at all hours of the day and night. I get up, go downstairs punch the alarm mute after verifying conditions, go to the basement and check there - nothing, then go back up two flights of stairs to bed. It has even occurred with the windows open and a stiff cross breeze in the room with the alarm.I called support, which was reminiscent of Microsoft support for Windows 95. "Brando" said it was most likely caused by one of two things - a power surge or bugs/dirt in the alarm. He admitted that this model was extremely sensitive to power surges. (Giant red flag!)He refused to do anything else until I ran down a can of air and blew out the alarm. I could see it was clean, it was only four months old and was in a clean, non-smoking environment. Brandon would have none of it. He was definitely going to be the man in charge and said false alarms could be caused by dirt left inside the unit at the (Chinese) factory, so I blew it out.Then he said to remount it, but leave the power disconnected for a few days. If the false alarms still occur, the unit is defective, you can call back and (supposedly) they will replace it - and you can repeat this process every few months until the warrantee (7 year limited) expires. However, if the false alarms stop when AC is disconnected, then you simply have power surges and it is not their problem.Reality - it IS their problem, whether the unit "went defective" or is defective by design and not able to withstand real world AC power. None of the 35+ false alarms in the last week have been accompanied by any other manifestations of power issues - clocks resetting, TV or computer glitches, etc. I am retired and am home most of the time - I would notice any significant power glitches and have noticed very short light dimming and such symptoms in the past from power fluctuations - but none associated with any of these false alarms. Our power is no more nor less stable than it has been at any other time over the last ten years when the old alarms worked without problem.So, you can either:1) Buy Kidde, experience repeated false alarms and either:a. Jump through support hoops to get them replaced every few monthsorb. Discover you have a "power issue" and need to replace them with another brand at your own expenseor2) Buy another brand to begin with and avoid the entire circusPS: After being repeatedly talked down to and rather bullied by "Brandon", I mentioned that I had spent four years teaching university physics and had some familiarity with electricity - probably more than he. His replay was "Oh yeah? Well, you don't know me or what I know." If you like dealing with this kind of attitude, you'll love dealing with Kidde support.