First Alert CO400 Carbon Monoxide Detector, Battery-Powered

Smart Specs & Features

Keep your family safe with our easy-to-use, battery-operated carbon monoxide (CO) alarm. Battery-powered alarms provide continuous monitoring, even during power failures.

Equipped with an advanced electrochemical CO sensor, this alarm accurately detects carbon monoxide levels no matter where it's placed in the room. The alarm sequence should last 5-6 seconds. If it doesn't sound, check if you have fresh batteries installed correctly and test again. If the unit still doesn't alarm, replace it immediately.

When CO levels reach dangerous levels, a loud 85-decibel alarm sounds. The battery is replaceable, ensuring long-lasting protection.

To ensure complete protection, place one on each level of your home and in each bedroom. Our alarms provide peace of mind and are rigorously tested to meet UL standards.

With a 5-year limited warranty and an end-of-life signal chirp, you'll know when it's time to replace the unit for safety. First Alert has been the most trusted brand in home safety since 1958, making sure you can count on us for your safety needs.