The Kidde Nighthawk Plug-In Carbon Monoxide Alarm with Digital Display (Model: KN-COPP-3 Nighthawk) is a reliable and efficient home security device that detects carbon monoxide gas with its battery and wall plug-in power source. This alarm is designed with a clear digital display, making it easy to read and interpret in the event of a potential danger. With a sleek white design this Kidde Nighthawk alarm ensures maximum protection and convenience for your household. Never opened sealed pack. Please check battery before usage.