Is it normal for the fire hydrant in the hotel room to have a red light flashing?

That's a fire alarm. This should be a smoke alarm for fire fighting, and this is for fire fighting, not a camera. Fire smoke detector is a kind of fire-fighting equipment, which is installed in the ceiling to detect the smoke concentration and duration in the smoke-proof space at any time. If the alarm value is reached, it will automatically alarm. The LED indicator of the smoke detector flashes every 40 seconds in the monitoring state and every 1 second in the alarm state. So you don't have to worry, that's the security guard serving you. This fire extinguisher will flash red. This red light is a fire alarm, so once this happens, you don't have to worry at all. Just play it normally. Similarly, if you know the standard of fire extinguishers in hotels, you can choose according to this standard.