First Alert 9V Carbon Monoxide Alarm is designed to provide reliable protection against carbon monoxide hazards in your home. This alarm uses an advanced electrochemical sensor to detect the presence of carbon monoxide, a colorless, odorless, and tasteless gas that is a leading cause of accidental poisoning deaths in the United States. Powered by a 9V battery, this portable device ensures continuous monitoring even during power outages. When d levels of carbon monoxide are detected, a loud 85-decibel alarm sounds to alert you immediately. The alarm also features a low battery warning with both a light and sound to keep you informed. Installation is simple—just insert the battery, and the alarm begins monitoring without any complicated setup. A single button allows you to silence the alarm or test the detector easily. Additionally, the alarm signals when it reaches the end of its lifespan, prompting timely for ongoing safety. Model Number: 1039718