The First Alert CO400 is a battery-powered carbon monoxide detector that offers reliable protection against CO threats. Equipped with an advanced electrochemical sensor, it detects carbon monoxide leaks from various sources, such as malfunctioning fuel-burning appliances and clogged chimneys.
The unit is simple to install and operate, requiring just a 9-volt battery to function, making it perfect for areas without AC power or as a backup in case of a power failure. A loud 85-decibel alarm is triggered when CO levels become dangerous, alerting you and your family to potential harm.
For maximum safety, it’s recommended to place a CO detector on every level of your home and in each bedroom, as carbon monoxide disperses evenly throughout a space. The CO400 features a straightforward design with a single button for testing or silencing the alarm and includes an end-of-life indicator to remind you when to replace the device.
Product Highlights
- Battery-powered carbon monoxide alarm provides continuous monitoring even during power outages
- Accurate CO detection via advanced electrochemical sensor in various room conditions
- Loud 85-decibel alarm for alerting to elevated CO levels; essential for home safety
- Comprehensive protection through installation on every level and in each bedroom
- 5-7 year warranty and end-of-life signal for ensured safety and device management
- Rigorously tested to meet UL standards for trustworthiness and performance









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