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Proximity Sensor
Active when the proximity sensor of the device reports than an object is nearby.
After setting this state up, you should calibrate it by covering and then uncovering proximity sensor a couple of times.
This state may be unreliable in a profile mixed with other contexts. If the purpose is to save power, some people have had more luck toggling the Monitor preference instead.
See Also: Menu / Prefs / Monitor / Display Off Monitoring / Proximity