What to Look for
Keep these features in mind when shopping for a CO alarm.


UL or ETL label
Shows the device meets current safety standards (UL 2034). Don't purchase any CO device that doesn't have either of these labels molded into it.

Battery backup
When the power cuts off—and the kerosene heaters, gas-powered generators, and fireplaces are called into service—you'll need a CO alarm that's not dependent on a plug.


LCD display
Shows short-term peaks in CO levels—any reading above 30 ppm merits investigation—before it reaches alarm-tripping concentrations. Units that display the highest level of CO alert you to a problem that needs fixing. If a poisoning has occurred, they help emergency personnel determine what type of treatment to administer.

Voice warning
Programmed announcement in combo CO/smoke alarm unit tells you the location and type of danger the alarm is responding to.

Wireless networking
Links alarms together without hard-wiring so that when one alarm is triggered, all alarms respond.
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