"The First Alert Hard Wired Smoke Alarms have been designed to install faster, perform better and be even smarter than before. Alarm has a large opening in the mounting bracket for easy access to wiring. Keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation. Battery installation and removal can occur while the unit is mounted to the ceiling or wall via the side load battery compartment. Connection to AC power is made with a 'Quick-Connect' wiring harness. These improvements help reduce nuisance alarms and save you time and money. Product Style Alarm, Batteries Required No, Senses Smoke and fire, Includes 6 Smoke detectors w/wiring harness and dust covers. Easy installation & maintenance Battery pull tab keeps the battery fresh until the home is occupied Two locking features prevent battery theft and/or theft of the unit Single button test/silence 9V battery backup Latching alarm indicator remembers which unit initiated an alarm Smart Technology helps reduce the number of nuisance alarms Perfect Mount allows for easy alignment of alarm Dust cover"
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