In my hotel room, there is a dark red light flashing in the air conditioning vent. According to the standard, it should not be a smoke detector. What else could it be?

The red light in the air conditioning vent may be a smoke alarm, a camera or an air quality sensor.

In order to determine the specific properties of this red light, you can try the following methods:

1. Observe the characteristics of the red light: smoke alarms generally flash quickly, and the color is generally red or yellow. The camera usually flashes continuously and the color is usually red or green. The air quality sensor does not blink, and the color is usually blue or green.

2. Check whether there are other facilities: If there are other facilities around the air conditioning vents, such as camera brackets or power cords, then this red light is probably a camera or an air quality sensor.

3. Contact the hotel management: You can ask the hotel management about the specific nature of this red light, and they may tell you the purpose and location of this red light.

4. Alarm handling: If you think this red light may be an illegal camera or air quality sensor, you can call the local public security department and tell them what you found.

Please note that if you find that the red light of the air conditioning vent does not meet any of the above conditions, or you are not sure about its specific nature, it is best to consult the local hotel management for confirmation.