This digital wall detector has high detection accuracy, wide ranges of applications. It is designed with 5 working modes, you can select appropriate mode according to the object you want to detect. Adopts LCD display with backlight. This product can quickly locate wood, metal and AC wires behind the walls, floors and ceilings of your house. When a metal is detected, it can indicate whether the metal is a magnetic metal. Multi-scene applications, whether industrial and domestic use, can easily cope with. Suitable for home decoration and renovation, wall decoration installation, equipment installation and maintenance, etc. Features: Multifunctional Design: This product can detect stud, metal and unshielded AC live wire. When a metal is detected, it can indicate whether the metal is a magnetic metal. It works on slats, wallpaper, wood floors, acoustical ceilings, painted walls and more. Avoids hazards when you install TVs, cabinets, garage racks and more.  LCD Display: Backlit LCD display, when the scanner approaches the stud, the LCD indicator bar will rise and the percentage will increase. When the center of a stud is located, the LCD will display the full indicator bar, and the buzzer will sound continuously. With signal bar, center indication, metal depth indication and other functions. 5 Working Modes Design: This product is designed with 5 working modes, you can select the mode between 12" stud scan mode, 1" stud scan mode, 1 12" stud scan mode, metal mode and AC mode according to the object you want to detect.  3 Stud Scan Modes: 12" 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 12" stud scan mode detects wood or metal studs up to 38mm deep. Metal Scan Mode: Mainly used to detect steel bars, metal keels, metal pipes, etc. in walls. The detection of magnetic metal can be as deep as 3.2 in. (80mm)(diameter15mm galvanized steel tube). It can detect non-magnetic metals up tc 2.4 in. (60mm) (diameter 13mm copper tube). AC Scan Mode: Mainly used to detect live (AC) wires in the wall. Detect unshielded AC live wire up to 2 in. (51mm) deep. And the AC scan mode has interactive calibration.  Easy to Use: Move the tester on the desired surface to detect for STUDS, metal, rebar, pipe, AC wire, etc., you can scan the object from left to right. Wide Applications: Multi-scene applications, whether industrial and domestic use, can easily cope with. Suitable for home decoration and renovation, wall decoration installation, appliance installation and maintenance, etc. Note:  This stud finder is for use on dry interior walls only. Sensing depth and accuracy can vary due to moisture, content of materials, wall texture, and paint. This stud finder is not designed to scan materials such as: ceramic floor tile, carpeting and padding, lath and plaster walls, foil covered insulation board, glass or any other dense material. Specifications: Name: Wall Metal Detector Material: ABS Battery: 1 * 9V 6F22 battery (not included) Operating current: less than 50ma Shutdown current: less than 10UA Automatic shutdown time: 3 minutes Item size: 145 * 60 * 30mm 5.71 * 2.36 * 1.18in Package size: 165 * 74 * 40mm 6.50 * 2.91 * 1.57in Package weight: 158g 5.57ounce Packing List: 1 * Wall Metal Detector 1 * Guideline