There is a light flashing at the entrance of the hotel.

The question you asked is that there is a light flashing in front of the hotel. What is that? That's a fire sprinkler.

The fire sprinkler will have a flashing red light, indicating that it is working normally. Most hotels have this device, and so does our office building. At the end of the year, there will be a building management to check, pump with pipes, sprinkler will call the police, and then spray water or foam to put out the fire.