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First Alert 10-Year Battery-operated Photoelectric Sensor

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3-volt lithium power cell means you don't need to replace batteries for the 10-year life of the alarm
Patented smoke entry system and photoelectric sensing technology leads to fewer false alarms
Half the depth of standard alarms; adds an element of style to safety

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3-volt lithium power cell means you don't need to replace batteries for the 10-year life of the alarm
Patented smoke entry system and photoelectric sensing technology leads to fewer false alarms
Half the depth of standard alarms; adds an element of style to safety
End of life signal alerts you when alarm needs to be replaced
Can be easily installed on wall or ceiling with easy-slide mounting bracket
Single button test/silence helps to ensure your alarm is working properly
10-year limited warranty