If you are talking about the little red light on smoke alarms ,if it is flashing it normaly means the battery is running low.Most are hard wired to the house but have battery backup .The battery should be checked about once a year to make sure it is

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Go to your electrical panel, look for a circuit breaker labeled "central alarm" or "smoke detector." Toggle the breaker into the off position. Take the smoke detector off its mounting bracket (from the ceiling) and disconnect the power cable. Take out the battery, press the "test" button, hold it down for at least 10 seconds.

If your smoke detector has a blinking red light that flashes every 10 seconds, it means that it is reacting from the after-effects of smoke 

The flashing red light gives a visual indication that the smoke alarm is functioning properly. It also indicates a working battery is connected to the smoke 

operation of your FireAngel smoke alarm. The SO-601 Toast Proof Smoke Alarm uses and the red LED will revert to flashing once every 40 seconds.

If your smoke detector is giving off an annoying beeping sound, then you might have to clean it. To start, remove the chamber or brace from the smoke detector. Then, clean out the chamber (or outer frame) by wiping/cleaning it with a lint-free cloth. After that, vacuum out the inside of the detector to remove any dust and dirt. 5. Smoke In The Air. When you see a blinking red light

The only light flashing was the red light (also at 40 second intervals), that indicates the alarm is working.

This smoke alarm also features Thermoptek technology to ensure a quick reaction to all fire types. When used in conjunction with a FireAngel Pro Connected Gateway, users can receive notification of alarm activations via a mobile device. Thermoptek optical smoke alarm – detects slow-smouldering fires, Features a sealed 10 year lifetime battery,

Similarly, a battery pull-tab that's still in place can be causing the disruption. The chirping can also be caused by pressing the silence button by mistake.

The FireAngel SW1‑R Smoke Alarm has been designed to make protecting your home simple, with easy install and testing and rigorous testing by independent parties, such as BSI