What is the flashing red light on the roof of the hotel?

1. The flashing instrument on the ceiling of a hotel room is usually a smoke detector. Its function is to detect whether there is smoke in the room and find the fire in time. Smoke detectors, also known as smoke fire detectors, smoke detectors, smoke detectors, smoke detectors and smoke sensors, are mainly used in fire protection systems and also in the construction of security systems.

2. It is a typical equipment that has been converted from space fire prevention measures to civilian use.