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Battery (DC) operated Smoke Alarms: Provide protection even when This Smoke Alarm is designed to be mounted on any standard wiring junction box to a 4-inch (10 cm) diagonal size, on ether the ceiling or wall (if allowed Disconnecting the power disables the alarm so it cannot electricity fails, provided the batteries are fresh and correctly installed. by local codes). Read “Recommended Locations For Smoke Alarms” and “Locations to Avoid For Smoke Alarms” before you begin installation. sense smoke