5 in 1 FunctionThe wall detector has 5 different scanning modes. Three types of stud mode scans wooden beams and joists in walls up to 13mm, 25mm and 38mm thick. Metal mode detects metal up to 60mm deep. AC Scan mode detects unshielded live electrical wires up to 51mm deep. Efficient and AccurateThis power cable detector is equipped with a highly efficient upgraded sensor, the LED screen indicator gives you clear direction and exact position of the target when you move this wall scanner along from a wall, a beep will tell you that the object has been found. You can quickly locate wood, metal studs, rebar, and live electrical wires in walls, floors, and behind ceilings. Easy CalibrationAn on/off/mode selection button and a calibration button make the stud finder very easy to calibrate and use. In stud mode, just calibrate on the wall, in metal and AC mode, please calibrate in air. Please make sure you calibrate in a location where there are no studs or AC wires nearby. Multiple uses This power cable detector is not only suitable for professional uses such as construction and industry, but also makes DIY at home easier and safer. When you need to drill holes in the wall, hang artwork, mount a TV, or install a ceiling light fixture, it will help you avoid drilling into metal and AC wires in the wall. Customer ServiceThe wall mounted metal detector comes with 1 9V battery, you don't need to buy it separately. If you have any questions, please contact us and we will provide you with satisfactory service.