More than likely there is a ground wire or neutral at least passing threw that switch box.
Occupancy sensor no ground no neutral.
Occupancy sensors require standby power to operate the sensor when the load is off.
I m a licensed electrician and major in electrical engineering.
I have an occupancy sensor that requires a neutral my old house only has the ground and hit in the swotch box.
3way occupancy sensor switch no neutral or grounding.
Maestro occupancy vacancy sensor dual circuit switch no neutral wire single pole 120 277 v.
Enbrighten z wave plus smart lighting control motion switch.
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Maestro dual circuit dual tech motion sensor switch 6a single pole or 3 way light almond.
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Maestro motion sensor switch 2 amp single pole light almond 2 pack multi technology wall switch motion sensor no neutral light almond.
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Some models require neutral others require ground which is used to draw power but the current is less than 1ma is considered harmless.
Topgreener pir passive infrared motion sensor switch no neutral required 4a 500w 1 8hp 120 277vac occupancy vacancy ground wire required single pole tdos5 j w white.
Maestro occupancy vacancy sensor dual circuit switch single pole 3 way 120 277 v.
Probably is will not work without the ground.
To do that it needs a path to neutral.