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The Kidde KN-COEG-3 AC powered alarm, CO plug-in and explosive gas protects you and your family from two deadly threats. The KN-COEG-3 includes a 9V backup battery that provides protection during a power outage, when AC-only units cannot provide protection. By pressing the peak level button you can see the maximum CO level recorded by the alarm since it was last reset or unplugged. The continuous digital display shows the level of carbon monoxide (if any) that the unit is detecting as well as whether the gas is present. The gas sensor is a metal oxide sensor designed to detect natural gas (methane) or propane. Temperature range: 40 degrees Fahrenheit at 100 degrees Fahrenheit.