1. 3 pieces of wood 0.5 inches deep 2. 3 pieces of wood 1 inch deep 3. Wood 3 x 1.5 inches deep 4.Metal Detection 5.Alternating current 6. Metal detection depth 7. Determine whether metal is magnetic or not Size: 195x88x38MM Weight: 187G Battery: 9V battery (shipped without battery) Battery model: 9v battery 6F22 Purpose: Quickly locate wood, metal and AC wires hidden in the walls, floors and ceilings of your home. It works on lath, wallpaper, wooden floors, acoustic ceilings, painted walls and more. Avoid dangers when you install , cabinets, garage racks, and more. Colour:Black Material:ABS Package Contents: 1 x Metal Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.