The First Alert CO710 carbon monoxide alarm with ten year battery and digital temperature display detects dangerous carbon monoxide for up to 10 years. This carbon monoxide detector uses an electrochemical carbon monoxide sensor. A built-in 10 years lithium battery means you never need to worry about changing batteries during the lifetime of the alarm. This stylish CO monitor is designed to sit on top of a dresser or tabletop and it has a backlit digital display that shows temperature and CO concentration. Features Advanced electrochemical CO sensor Stylish design with LED temperature display Built-in 10 years battery for a decade of detection Multi-function, backlit digital display Peak level feature retrieves the highest concentration of carbon monoxide measured Powered by sealed, 10 years lithium batteries to provide continuous protection for ten years without battery replacement Modern, compact design allows easy tabletop or wall mount placement