Traditional Culture Encyclopedia - Hotel accommodation - Why are there red dots flashing in the hotel lights?

Why are there red dots flashing in the hotel lights?

Fire sprinkler, smoke detector.

1, fire sprinkler: there is a red dot flashing in the hotel room, which is the normal action of the fire sprinkler in the room. If it blinks for a long time, it means it is in a fault state.

2. Smoke detector: There is a red dot flashing in the hotel room. When the smoke in the room reaches a certain concentration, it will cause the smoke alarm to alarm.