Smoke Alarm Detector- 4 pack

New. Open Box Item Smoke Detector 4 Pack Fire Alarms 9V Battery Operated Photoelectric Sensor Smoke Alarms Easy to Install with Light Sound Warning, Test Button,9V Battery Included Fire Safety for Home Hotel Accurate & Sensitive: The small size smoke alarm adopts photoelectric technology to detect smoke, which is more sensitive to light smoke and slow smoldering fires and more quickly to remind you. Keep your home safe 24/7 Photoelectric Technology&Material: Fire-Retardant ABS V0 Level. 9V Battery-Powered Photoelectric sensor Smoke Alarm. photoelectric technology which is optimized to detect slow smoldering fires which generate light smoke, little heat and may smolder from all directions for hours before bursting into flames. Test Button: Test smoke alarm every week by pressing the test button in the middle of the cover for 5 seconds. Please change batteries when smoke detector inform low battery, smoke alarm “chirp” every 32 seconds and the red LED flashes at the same time Sound & LED Warning: If fire alarm detects smoke or combustion particles in the air, it will sound in 85db and red LED will flash rapidly to remind every member to check. If fault, please clean dust or smoke inside smoke alarm with fan