What is the flashing red dot on the top of the hotel room?

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.

Fire sprinklers are used in fire sprinkler systems. When a fire breaks out, the sprinkler is sprayed with water through the sprinkler splash plate, which is divided into drooping sprinkler, vertical sprinkler, ordinary sprinkler and side wall sprinkler.

According to the definition in GB 5135.1.3.1,the sprinkler is a kind of sprinkler that starts itself within a predetermined temperature range under the action of heat, or is started by a control device according to a fire signal, and sprays water according to the designed sprinkler shape and flow.

Extended data

Concealed spraying is suitable for high-end hotels, houses, theaters and other places that need to ensure the smooth and tidy effect of smallpox.

The cover of the concealed spray is welded on the thread with fusible metal, with melting point of 57 degrees. Therefore, in case of fire, when the temperature rises, the cover will be removed first, and then when the temperature rises to 68 degrees (usually the nozzle), the glass tube will burst and water will be sprayed out. Therefore, the most taboo of hidden sprinkler is that the cover is stained with paint and coating, which will cause action failure.

Baidu Encyclopedia-Fire Control spray head