Protect yourself and your loved ones from the dangers of carbon monoxide with the First Alert CO400B. This battery-operated carbon monoxide alarm is ideal for use in any home and is manufactured in the United States to ensure top-notch quality. It alerts you with a loud 85-decibel alarm when it detects dangerous levels of carbon monoxide, giving you and your family ample time to evacuate the premises and seek medical attention if necessary. The alarm is powered by a reliable battery, ensuring that it will continue to function even in the event of a power outage. Trust First Alert, the leading brand in home safety, to keep you and your family safe from the dangers of carbon monoxide.