Can detect iron (steel strip, copper pipe) and cables hidden in walls, ceilings, and floors. It can also detect wooden beams, metals, and cables hidden under plasterboard. Wide range of detection: can detect metals, wires, and wood. This will not be dangerous when drilling holes in the wall. Maximum detection depth: Magnetic metal: 12 centimeters Non-magnetic: 10 centimeters AC: 5 centimeters Wood: 3.8 centimeters Battery type: 9V universal battery (not included) Operating time: about 6 hours Automatic shutdown: automatic shutdown after five minutes of inactivity. The detection result of materials will be affected by the detected object and its size, as well as the material and surface condition of the detection area. If the cable is not charged, the detection depth will be reduced. Maximum detection depth: Ferrous 120 mm AC 50 Copper wires 40 mm Foreign material (commonly referred to as wood) 38 mm in precise mode and 38 mm in deep mode Automatic shutdown time: about 5 minutes