The First Alert 1039741 Carbon Monoxide Alarm is a reliable and essential home security device that comes in a convenient 2-pack with 9V batteries included. This alarm from a trusted brand like First Alert is designed to detect carbon monoxide leaks, providing you and your family with peace of mind knowing that you will be alerted in case of an emergency. With its battery power source, this alarm ensures that your home is protected even during power outages, making it a practical and crucial choice for any household.