BEACHWATER Smoke Detector Fire Alarms 3 Pack

Sound LED warning:When the 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.fire alarms smoke detectors can ...Sound LED warning:When the 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.fire alarms smoke detectors can only sound their alarms when they detect smoke or detect combustion particles in the air.They do not sense heat,flame,or gas.