Kidde Nighthawk Carbon Monoxide Detector, AC-Plug-In with Battery Back is a carbon monoxide detector that can be plugged into any outlet in your home. It has a battery backup in case of power failure, and it is easy to install. The Kidde Nighthawk Carbon Monoxide Detector is a must-have for any home. Carbon monoxide is a colorless, odorless gas that is produced when burning fossil fuels. It is dangerous because it can build up in enclosed spaces and cause death. The Kidde Nighthawk Carbon Monoxide Detector is designed to detect carbon monoxide and alert you when it reaches dangerous levels. The Kidde Nighthawk Carbon Monoxide Detector is easy to install. Just plug it into any outlet in your home. It can also be placed on a table with the included extension cord. The Kidde Nighthawk Carbon Monoxide Detector is an important part of any home safety plan.