That round, grille-covered disc on your hotel ceiling is most likely a speaker, not a smoke detector.
It’s usually part of the building’s emergency or fire-alarm communication system.
The speaker delivers one-way announcements, such as evacuation instructions, from a central system.
It may look like an intercom, but you generally can’t talk back through it…See image below
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When visiting someone’s home, respect their privacy and avoid opening drawers, cabinets, bedrooms, or the fridge without permission. Don’t handle valuables, collectibles, personal documents, medicine, or electronics…