Smoke Detector,Andyssey Fire Alarm Smoke Detector 9V Battery Replaceable Photoelectric Smoke Alarms with Low Battery Warning, Fire Detector for Homes,with UL Listed, 3 Packs

Testing: Test weekly by pushing the test button on the cover and holding it down for a minimum of 5 seconds. Smoke detector will sound the alarm if the electronic circuitry, horn, and battery are working properly.
Battery Powered: Smoke detector replaceable disposable 9-volt carbon battery,replace the battery annually. Fire alarms smoke detectors in the battery power will be low when the “squeak” warning, accompanied by a red LED flashing.
Alarm Condition: When the smoke alarm senses products of combustion and goes into alarm, the red LED will flash rapidly (one flash per second).The rapid flashing LED and pulsating alarm will continue until the air is cleared or the test button is released.