I'm currently staying in a higher end hotel in Beijing. With the lights out I noticed a faint light coming from the register near the ceiling. Upon closer inspection I noticed 2 plastic boxes with cables running to them inside the vent.
The register itself has small needles on it that shocked me when my fingers got close. There is a logo on the register that says Winsun.
I'm assuming this is some kind of fancy thermostat sensor but I'd love some confirmation. Thanks.
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