What is this on the ceiling of a hotel room? There are red lights flashing

The red light flashing on the ceiling of the hotel room is the smoke detector set up by the fire alarm system. It is used to prevent fires. You can relax, because hotel rooms are private spaces, and hotels are not allowed to install probes. If there is too much smoke in the room, the smoke detector will alarm. When there is a fire in the room, the fire sprinkler will automatically start sprinkling water. Fire extinguishing ensures the safety of every customer.