Lamp lights when there is movement in the room and remains lit as long as someone is there. Time lag can be adjusted from 10 seconds to 4 minutes from the most recent movement.
Since the existing switch was difficult to reach the user replaced it with a motion detector.
Appliance store, in Sweden for example Clas Ohlson, clasohlson.com (last checked April 2020)
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This tip is from 2005