Since I have but what absolutely genales bought depends on me over the front door in the stairwell. Can therefore always good to recognize who is at the door :-) sneak in the dark is no longer! The "working range" of the lamp was made to fit on the sensor ball in black marker, so the light turns on only when someone is at the door and not just passing or want in the apartment next door. Fine part, every euro buy recommendation is worth it., On my part.