The First Alert CO2 Carbon Monoxide Alarm with 10-year battery and digital temperature display provides convenient and reliable carbon monoxide protection. This carbon monoxide detector does not require installation - simply place on a tabletop or shelf throughout your home or with you on the go. The built-in 10-year lithium battery means you don't need to worry about changing batteries or low battery chirps during the lifetime of the detector. This stylish CO monitor also has a backlit digital display that shows temperature and CO concentration when detected. CO detector alerts you to elevated carbon monoxide levels Easy-to-read backlit digital LED display shows temperature and elevated levels of CO Built-in 10-year sealed lithium battery offers continuous protection for the life of the carbon monoxide detector Stylish design intended to sit on a tabletop, no installation is required Loud 85-decibel alarm sounds when elevated CO levels are detected.