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🚨 Stay one step ahead with the smartest CO alarm on the block!
The First Alert CO400 is a battery-powered carbon monoxide alarm featuring an electrochemical sensor for precise detection, an 85dB alarm for unmistakable alerts, and a user-friendly silence/test button. Its compact design allows easy installation anywhere, supported by a 5-year warranty and an end-of-life timer to ensure continuous protection.
| ASIN | B000N8OYXI |
| Alarm | Audible |
| Best Sellers Rank | #22,904 in Home Improvement ( See Top 100 in Home Improvement ) #48 in Home Security Alarms |
| Brand | First Alert |
| Built-In Media | 1 Piece Powered Carbon Monoxide Alarm |
| Colour | White |
| Customer Reviews | 4.6 out of 5 stars 16,901 Reviews |
| Enclosure Material | Multi |
| Global Trade Identification Number | 00029054000699 |
| Item Dimensions D x W x H | 2.5D x 12.7W x 7.6H Centimeters |
| Item Type Name | First Alert CO400FF Battery Powered Carbon Monoxide Alarm |
| Item Weight | 0.45 Pounds |
| Manufacturer | Jarden Safety |
| Manufacturer Warranty Description | 5 year warranty |
| Mfr Part Number | CO400 |
| Model Number | CO400 |
| Number of Items | 1 |
| Operating Humidity | 10-95% RH |
| Power Source | Battery Powered |
| Product Dimensions | 2.5D x 12.7W x 7.6H Centimeters |
| Product Style | Simple |
| Sensor Type | Electrochemical |
| Style | Simple |
| UPC | 029054000699 |
| Unit Count | 1.0 Count |
M**E
Good Product
I bought five of these and installed them in minutes. I’d recommend this to anyone.
J**.
Simple, reliable, and essential for home safety
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.
A**R
Excellent and easy to install
I purchased this alarm to install in the upstairs hallway between bedrooms. It was very easy to install and works perfectly and provides the added security I required. I was surprised and happy at how quickly the parcel arrived!
G**R
Saved my life
Installed as soon as they arrived to replace older models that the batteries had expired in (7 year batteries and no maintenance or replacement option). These do have batteries that have to be or can be replaced. The 2nd night after installation, the detector I had mounted in my bedroom (installed all 6 throughout my house) went off around 2:00 AM and awakened me. I immediately shut my gas furnace down and called a HVAC company. They found a crack in my heat exchanger as well as issue with the flue or exhaust pipe that was allowing CO to enter my home. Had I not replaced my CO detectors when I did, I wouldn't be writing this review now. Well worth my investment!! Easy installation and had all 6 up and operating in less than 30 minutes as well as reasonably priced. Purchased this pack of 6 for less that the other 2 I had bought 7 years ago.
C**K
Seems good
Quickly mounted to the wall and put batteries in. Tested. Made beep noises that split eardrums. Due to the battery nature of it it can mount anywhere close to the ground to detect CO quickly. I wont truly know if it works, and I hope I never need to, but appears solid.
Trustpilot
3 days ago
2 days ago