Excuse me, what are these two things in the hotel? The white one keeps flashing. Thank you.

The flashing white thing in the hotel may be a smoke alarm.

Smoke alarm, called fire smoke alarm, smoke sensor, smoke sensor, etc. Powered by bus, it can be connected to multiple buses. They are networked and communicated with the fire alarm controller to form an alarm system. When giving an alarm, they send out sound and light alarm signals to indicate the location of the fire and automatically start the smoke exhaust fan.

Any smoke alarm connected to the bus can alarm, so as to achieve the purpose of alarm.

If there is smoke in the hotel, the smoke alarm will give an alarm to remind people of the smoke.

I hope my answer is helpful to you. Please feel free to let me know if you have any questions or need help.