FIRST ALERT Battery-Powered Carbon Monoxide Alarm, Black (CO410), 120 V, 1 Pack

I bought this on the 14th July'24, and I just realised that the expiry date on the product is 8th January '24, so it was already unsafe to use when I bought it...

Easy to install. Works well.

Flimsy battery cover that broke on the first day. It’s also not been reading stuff.

Bought open box return, it was old and at end of life when i put in the battery. Flashed END... someone bought a new one and returned their old one. I got a refund no problems. Then picked up a new one and it works great! I like the readout that shows if there was any CO present in the history. I did get it someplace else. and liked the reviews on consumer reports, 80 out of 100. the better ones were linkable and / or plug in.

This unit is easy to use and utilizes regular batteries (many nowadays do not). This comes with a Peak CO Level Indicator, which I like because you can check it to see if you have any CO registering at all (I never have), which is better than waiting until you have enough to set off an alarm, which is very bad.

So I originally bought this SAME exact CO detector/alarm from Amazon back in December 2017. (The little Amazon tag came up telling me when I last purchased it.) I am still using it. It is actually sitting on the chest of drawers in one of my bedrooms. It appears to be working well. I haven't needed to change the batteries yet (in almost 2 years), and it has never alarmed. But I want to share something I learned after purchasing 4 different "retail" CO detector/alarms (so that I had different ones if one didn't work as it was designed). All of these "retail" alarms readily available at most retail brick and mortar stores and online stores (like Amazon), only alarm you once levels are dangerously high (like you need to evacuate the house now, high). They do not show you if you have low levels of CO over many months (which is equally dangerous as ONE high instance). They will again only alarm once it is at the dangerous level. I am NOT saying NOT to get these. Because obviously having a CO alarm is definitely needed ... and this is better than no CO alarm at all. Instead, I am saying if you are looking for a device that MONITORS and displays CO levels as low as 5ppm (versus the 30ppm), I highly recommend the Defender LL6070 Low Level Carbon Monoxide Monitor-Alarm. Because we have older gas heaters, I purchased 2 of the Defender LL6070 Low Level Carbon Monoxide Monitor-Alarms (each one mounted in a hallway close to the heating units). They are significantly more expensive (@ $160/each) and they only have about a 3-year life. However, for those with compromised immune systems, babies, seniors, other health issues, and pets, it is important to know if you have a low-level CO leak. Exposure to low levels of CO over time is also very dangerous. I was told some times when older heating units start to fail, they can start leaking CO. In any case, I feel better having the Defender LL6070 Low Level Carbon Monoxide Monitor-Alarms. I also still have all of the "retail" alarms in each of the bedrooms, because they do serve an important function. I just thought it was important to know that these "retail" devices are only high level CO alarms ... not low level CO monitors.