FIRE ALARMS SMOKE DETECTORS: The smoke alarm adopts photoelectric technology to detect smoke. More sensitive to light smoke and slow smoldering fires and more quickly to remind you. Keep your home safe 24/7. | TEST BUTTON: ''Test'' button allows you to test the fire alarm once a month. Low battery signal makes you can know whether the alarm has sufficient power easily. | Sound & LED Warning: When the fire alarm detects smoke or detect combustion particles in the air, it will sound their alarms and the red LED will flash rapidly to remind you to check. | EASY INSTALLATION: The smoke detector can easily install with mounting bracket. No hardwired anymore and you can install it wherever you want. | HOME PROTECTION: According to US data analysis, a family fire begins every 38 seconds. The faster you know about the fire, the sooner you start moving your family, and the smoke alarm at work reduces the risk of home fire deaths by 50%.