1.Smallest stud finder in the world 2.Stud detector,find woods,metal,voltage 3.with laser line and LCD light 4.3 ... /OFF for the wall detection until LED light turns red,please wait until LED turns greed and then move the ... to indicate findings,continue to move the detector till LED light stop flashing,it means leaving the detected objects4. ... direction,the midpoint between two mark of the stud.