Smoke Alarm Battery Operated Smoke Detector with 10 Years Life, Isafenest Photoelectric Fire Alarm with Loud Alarm, Intelligent Auto-Check Fire Detector for Home, 2 Pack

Timely Alert, Self-check, Test FunctionSupport timely alert: The 85 dB buzzer and flashing red indicator light can remind you day and night to protect you and your family.Support self-check: The red indicator light flashes every 33 seconds to ensure that it is working properly.Support test function: Press the test button to check if the fire alarm works correctly and ensure its sensitivity.Dura...