First Alert Battery Carbon Monoxide Alarm

I recently purchased this First Alert CO400 detector to add another layer of safety to my home, and I’m very satisfied with the experience. What I appreciate most is the straightforward, battery-operated design. It was incredibly easy to set up—no hardwiring or complex installation required, which makes it perfect for placing exactly where you need it without worrying about electrical outlets. The unit feels sturdy and well-built, and the alarm is loud and impossible to miss. It provides great peace of mind, especially given how unobtrusive and reliable it has been since I installed it. For anyone looking for a no-fuss, effective way to monitor carbon monoxide levels in their living space, this is a solid, must-have product.

Easy to install. Exactly as described an appraiser approved.

Our old one timed out and alerted us. This is the direct replacement for that model that has worked very well for us for a long time. I’m very satisfied with this product.

This is my second one of these. The first one lasted about 7 years before it started chirping and wouldn't stop. I thought it was the battery, but no, so I chucked it and bought this one. First Alert is a big name, so I trust it. Apparently, like smoke detectors, they have to be replaced every so often. The only thing I don't like about it is that there is a code for the number of chirps, and it's not printed clearly on the back, which would be nice. I have no time to look stuff up, but unless there's a problem, it's quiet.

I purchased two packs of the pack of 2. So far so good!? Tested fine. Hope it actually works, which is why I went with a name brand. This is not the place to skimp. The C0400 carbon monoxide detector comes with a 9 volt battery. I knew I needed to replace my existing detector (they dont last forever, and need to be replaced ever so often) and I did not want the plug in style. I wanted battery operated so I could place it wherever I wanted and not be limited to available outlets. I also bought a second pack as a gift. I prefer giving practical, functional gifts, especially stuff that people tend to not want to buy, such as smoke alarms, fire extinguishers, carbon monoxide detectors. If you travel, consider a battery operated detector such as this. Dont trust that a hotel room has you covered, or someone else's house. It is small and light weight enough that it should be the thing to pack (take out battery, store separately until in room). I will likely buy an additional pack. Right now I have one on the first floor, and one outside my second floor bedroom door. I think having one in the basement and another in actual bedroom or elsewhere (spread out) would be better. Watch for sales, but if need be just buy them at any cost so you have them. I am even thinking about adding one to my winter car kit. If ever stuck in a blizzard and had to stay in my car for any length of time, having a detector will help as CO2 levels can quickly rise if running car (or if a few people are simply breathing without the window open a crack) to keep warm. Tail pipes can easily clog especially if windy. So yeh, simple thing to stay safe and alive

Since I bought a gas stove I just thought I needed this and I'm glad I have it. Seems to be a good product thus far

They work great. Love the test feature. Installed on each floor outside bedrooms. Easy installation. Easy to put in batteries.

works as intended, came with the batteries and hasn't malfunctioned yet. Good.