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The system is designed to dial out on a phone line to a central station or a police monitoring system. These alarms have built in warnings for a failure in the phone line. This is a safeguard so you know the system is not working properly. So long as the system is operational and cut off from the phone line, it will continue to beep. By removing parts of ...


Here's at least one for you: http://firstalert.com/component/flexicontent/82-explosive-gas-co/929-plug-in-combination-explosive-gas-carbon-monoxide-alarm I don't know why combination alarms are not more common. Maybe because natural gas has an odor added so it's readily apparent, unlike CO? There also aren't any dual smoke detector (ionizing and ...

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