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If your CO alarm chirps every 30 seconds, it's not an emergency but you should replace the CO alarm a.s.a.p. - Fire Line
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Kidde 10SCO Combination Smoke and Carbon Monoxide Alarm with Voice Notification : Amazon.co.uk: DIY & Tools
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10 Year Life Carbon Monoxide CO Alarm Detector Kidde K7CO - Light and Power Solutions Ltd - Lighting and Electrical Wholesale
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Kalrin Carbon Monoxide Alarm Detector, CO Alarm with 10-Year Sensor, LED Digital Display for Home Office Garage EN 50291 Standard Battery Operated (Not included) : Amazon.co.uk: DIY & Tools
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Kidde AC Plug-In Carbon Monoxide Detector with Battery Backup, CO Alarm with LED Light Indicators - Walmart.com
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