What is that circular device with a red light on the ceiling of the hotel?

Usually light-colored, round, with a diameter of about 10 cm and a height of no more than 10 cm, it is attached to the ceiling. Under normal working conditions, there will be a small red light flashing, which can't be seen without special attention.

The function of smoke alarm is that when the indoor smoke concentration reaches a certain value, it will automatically give out a harsh alarm, and some will be connected to the fire control center. Don't worry about such alarms.

Matters needing attention in using smoke alarm

1. Press the test button for at least 3 seconds, and it will send out a crisp and loud pulse alarm signal.

2. This means that the detector really works, the LED flashes quickly and gives an alarm at the same time.

3. You can also test the detector by blowing air into the detector cavity. (Do a test once a week to prove the reliable operation of the detector)

4. Do not install the ground with high temperature and humidity, otherwise it will affect the sensitivity.

5. In order to keep the sensor working efficiently, it is necessary to clean the sensor every six months. First turn off the power supply, then gently sweep away the dust with a soft brush, and then start the power supply.

Baidu encyclopedia-smoke alarm