Find peace of mind with the latest CO detection from North America's #1 home fire safety brand.* The Kidde Carbon Monoxide Alarm model COP alarms at dangerous levels of CO to help give you more time to get out safely. This portable alarm features a rotating plug that installs upright in most outlets and it can be taken along when traveling.** Equipped with end-of-life notifications, it beeps to remind you it's time to replace it 10 years after it's powered. And it's comprehensively tested and designed to the latest UL standard for safety and reliability. Power Surge Immunity - Helps you stay protected during voltage fluctuations and power surges. End-of-Life Notifications - Eliminate the guesswork with replacement reminders after 10 years. Rotating Plug + 2 AA Backup Batteries - Turns 90° to install upright in most outlets and backup batteries provide temporary power during short-term outages.