First Alert CO400CN2 Carbon Monoxide Alarm, Battery Powered, 2-Pack

Keep your family safe with this 2-Pack of easy to use, battery operated carbon monoxide alarms; battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, no matter where the detector is placed in the room A loud 85-decibel alarm sounds when CO levels reach dangerous levels To ensure complete protection make sure to place one on each level of your home and in each bedroom Equipped with end-of-life signal chirp, so you know when its time to replace the unit for safety All First Alert CO alarms are rigorously tested to meet UL standards