








🚨 Stay ahead of danger with First Alert’s smartest CO detector yet!
The First Alert CO400 is a battery-powered carbon monoxide detector featuring a highly accurate electrochemical sensor and a loud 85 dB alarm. Its 9V replaceable battery ensures continuous monitoring even during outages, while smart alerts notify you when to replace batteries or the unit. With no installation required and a sleek design, it offers reliable, hassle-free protection backed by a 5-year limited warranty and UL certification.







| Brand | First Alert |
| Style | Battery Powered |
| Power Source | Battery Powered |
| Color | White |
| Product Dimensions | 1"D x 5"W x 3"H |
| Item Weight | 7.2 ounces |
| Alarm | Audible |
| Operating Humidity | 10-95% RH |
| Sensor Type | Electrochemical |
| Global Trade Identification Number | 00029054000699 |
| Material | Multi |
| Number of Items | 1 |
| Manufacturer | First Alert |
| UPC | 029054000699 |
| Part Number | CO400 |
| Item model number | CO400 |
| Batteries | 2 AA batteries required. (included) |
| Is Discontinued By Manufacturer | No |
| Size | Pack of 1 |
| Pattern | Detector |
| Voltage | 120 Volts |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |
| Certification | UL2034 |
| Included Components | Alarm; Mounting Bracket; User Manual; 9V Battery |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Description Pile | 9V battery |
| Warranty Description | 5 Year Limited Warranty |
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