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Battery-operated Photoelectric Combination Smoke and Carbon Monoxide Detector with Voice Alert

First Alert Battery-operated Photoelectric Combination Smoke and Carbon Monoxide Detector with Voice Alert

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At what reading and timeframe will the CO2 alarm sound?


The basic UL standard which is garbage. When it goes off, it'll almost be too late. Get a low level CO detector that will alarm so you can be safe and not require medical treatment. They are more expensive, but we'll worth it. The UL standard is only designed to barely allow you to get to safety and prevent calls to the fire department.

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Hi Judy, UL2034 requires residential CO Alarms to sound when exposed to levels of CO and exposure times: 70 ppm for 60-240 minutes, 150 ppm for 10-50 minutes, 400 ppm for 4-15 minutes. - Maria

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