Features:
• Keep your family safe from carbon monoxide in multiple rooms with this convenient plug-in carbon monoxide alarm 3-pack; the alarms work with any standard outlet and also have a battery backup for 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
• Simple to use, with a single test/silence button; a loud 85-decibel alarm sounds when Carbon Monoxide levels reach dangerous levels
• To ensure complete protection make sure to place one on each level of your home and in each bedroom
• 7-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