First Alert CO400 Carbon Monoxide (CO) Detector, Battery Operated Alarm, 1-Pack

• Keep your family safe with this easy to use, battery operated carbon monoxide alarm; 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.The alarm sequence should last 5-6 seconds. If it does not alarm, make sure fresh batteries are correctly installed, and test it again. If the unit still does not alarm, replace it immediately

• A loud 85 decibel alarm sounds when CO levels reach dangerous , Battery Replaceable - Yes

• To ensure complete protection make sure to place one on each level of your home and in each bedroom

• 5-year limited warranty; Equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety

• All first alert CO alarms are rigorously tested to meet UL standards

• First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)