There is a circle on the top of the hotel room, and the lights keep flashing. What is this?

It's a fire sprinkler. It's flashing red, which means it's working normally. Generally, hotels have such equipment, and so does our office building. There will be a building management to test it at the end of next year. Pump with a pipe, the sprinkler will give an alarm, and then spray water or foam to put out the fire.

A ball with a red light on the top of the hotel room is a smoke alarm (smoke sensor). When there is a fire in the room, it will give an alarm, and the fire sprinkler will automatically start sprinkling water to extinguish the fire. Generally, independent and physical product batteries or AC batteries are used as backup power supply, which can give out audible and visual instructions when giving an alarm, so it is called independent smoke alarm. Smoke detectors are divided into areas with and without address codes.

Extended data

Automatic control series

Automatic control automatic sprinkler system is a kind of fire extinguishing facility which can automatically turn on the sprinkler to extinguish fire and send out fire alarm signals at the same time. Automatic sprinkler system has the advantages of automatic sprinkler, automatic alarm and cooling initial fire, and can work synchronously with other fire-fighting facilities, so it can effectively control and extinguish initial fire. Now it has been widely used in building fire prevention.

Automatic sprinkler systems are divided into smoke-sensing type and temperature-sensing type.

Refer to Baidu fire sprinkler system encyclopedia.