Why are there red spots after turning off the lights in a hotel?

It's a fire sprinkler, and there will be a flashing red light, which means it works normally.

Most hotels have this device, and so does our office building. At the end of the year, there will be building management inspection, pipe pumping, sprinkler alarm, and then water spraying or foam fire fighting.

Automatic sprinkler system is a kind of fire extinguishing device and a widely used fixed fire fighting facility, which has the characteristics of low price and high fire extinguishing efficiency. According to different functions, it can be divided into manual control and automatic control.

The system is equipped with an alarm device, which can automatically give an alarm in case of fire. The automatic control fire sprinkler system can spray automatically and cooperate with other fire control facilities, so it can effectively control and extinguish the initial fire.