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Homes built within the last 15 years most likely have an interconnected system. (Homes built after 1993 were required to have an interconnected system) Buy one AC Powered smoke alarm and replace only one of the smoke alarms already in your inconnected system. This will allow you to expand your coverage by adding battery powered smoke alarms to areas of the house that are not covered with your existing system. Again, sounder alarms can be added to this system for added protection.