on the building and the jurisdiction it was wired to satisfy. If you’re already in the habit of poking around your room, it fits right alongside knowing why to keep the bathroom light on overnight and other small hotel-room details worth understanding.
What It Is Definitely Not
Online, the theories get colorful. It’s not a hidden microphone recording the room. It’s not a secret camera. And it is not the smoke detector, which, as noted, is its own separate unit.
One popular worry is that it’s a vapor sensor planted
