Two-thirds of the smoke alarms in non-confined home structure fires are battery-operated. Homes built after 1980 are more likely to have hardwired smoke alarms. Hardwired smoke alarms tend to be interconnected so that if one sounds, all will sound. This can provide earlier warning throughout the home regardless of the location of the fire and the location of the occupants. Only 7 percent of the failures found in the 2000-2004 study were due to hardwired power-source problems.

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