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What is the difference between a vacancy sensor and an occupancy sensor ?

An occupancy sensor turn lights ON automatically upon the detection of motion then turns the lights OFF automatically soon after an area is vacated. Occupancy sensors may offer an option selection to switch the occupancy sensor from automatically turning the lighting on to A vacancy sensor requires manual activation of the lighting by the occupant then turns the lights OFF automatically soon after an area is vacated.
 A vacancy sensor does not offer an option of automatically turning lighting on requiring a manual button press from the occupant (manual/vacancy mode).