Product Features 1/2"Stud Scan Mode:Detects wood or metal studs up to 13mm deep 1"Stud Scan Mode:Detects wood or metal studs up to 25mm deep 1 1/2"Stud Scan Mode:Detects wood or metal studs up to 38mm deep Metal Mode:Detects metal up to 80mm for magnetic(60mm for non-magnetic) deep AC Mode:Detects live unshielded AC wires up to 51mm deep Metal Depth Indicator Green Backlight .Low Voltage Indicator Battery Type:9V battery(6F22) Operating Current:<50ma Shutdown Current:<10UA Automatic Shutdown Time:3 minutes 1.Detection Mode Selection Stud Mode In stud mode, there are 3 scan modes o choose for properly thick of the scanning surface: 1/2"Scan Mode can detect 1/2 in. (13mn) deep. 1"Scan Mode can detect 1 in. (25mm)deep. 1 1/2"Scan Mode can detect 1 1/2 in.(38mm) deep. If you don't know the depth of the detection, it is recommended to use 1/2"scan mode first. When 1/2"scan mode is not detected, use 1"or 1 1/2"scan mode instead. Metal Mode: The detection of magnetic metal can be as deep as 3.2 in. (80mm)(diameter 15mm galvanized steel tube) It can detect non-magnetic metals up tc 2.4 in. (60mm) (diameter 13mm copper tube). AC Mode: Detect unshielded AC live wire up to 2 in. (51mm) deep. Purpose: Quickly locate wood, metal, and AC wires hidden in the walls, floors, and ceilings of a house. It can work in Flat noodles, wallpaper, wood floor, acoustic ceiling, spray painted wall and other places. Prevent you from encountering danger when installing televisions, cabinets, garage racks, etc. Notice: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.