Features: Come with LCD-screen and audio-alarm, convenient to use. This will keep you away from AC-power line and no need worry about safety hazards during construction. You can switch to the appropriate mode to help you find the center and edge of the wood, joist or beam, live AC-wires and metal in the wall accurately. 4 in 1 Multi-function Detection: The stud scan features 4 modes: Stud scan: 0.75in/19mm deep, stud scan: 1.5in/38mm, metal scan: 2.36in/60mm deep, AC-scan: 2in/51mm deep Accurate Smart-Sensor: This stud finder is equipped with upgraded sensor chip. It can accurately and quickly locate the studs, metals, pipes and live AC-wires behind wall, floors and ceilings. Specifications: Material: Plastic Scan Modes: Stud Scan 1: 0.75in/19mm Stud Scan 2: 1.5in/38mm Metal Scan: 2.36in/60mm AC-Scan: 2in/51mm Display: LED Backlit Screen Size: About. 172x76x37mm/6.77x2.99x1.46in Note: 1x9V battery needed.(NOT Included) Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xWall Scanner