This listing is for two FireAngel FA3820 carbon monoxide alarms, each with a 10-year battery life. These detectors are designed to keep your home safe from potential carbon monoxide hazards. They are easy to instal and come with a manufacturer warranty of 10 years. The FireAngel brand is known for its high-quality home security products, and these carbon monoxide detectors are no exception. They are perfect for any home or living space and are a must-have for anyone concerned about potential gas leaks. With their reliable battery life and easy-to-use design, these detectors will provide you with peace of mind for years to come.