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Protect your staff and customers from carbon monoxide fumes with this First Alert carbon monoxide alarm. An 85dB alert system provides a loud warning signal when elevated carbon monoxide levels are detected, and a single button lets you test or silence the alarm. Battery-powered operation means there's no hard-wired installation required, making this alarm easy to place in an office, kitchen or garage. This First Alert carbon monoxide alarm features an electrochemical carbon monoxide sensor for accurate, dependable results.