1. High accuracy and consistency: This metal detector uses the most advanced internal sensor. It captures the change of the spatial density behind the wall and locates the bolt centre with high accuracy. In addition, the cable finder also shows the edges of the pins. The edges help you check the positions. 2. Maximum detection depth 60 mm: wall scanner detector detects bolts, wood, metal and AC cables with high sensitivity. The 3/4 scan modes and the 11/2 scan modes can each measure the middle and edges of wood up to 19 mm and 38 mm deep. In addition, the metal scan modes can be used metals with a depth of up to 2.36 mm. 3. Cable protection indicator: the cable warning detection is up to 51 mm deep. The advantage is that when scanning in bolt scan modes/depth scan modes/metal scan modes, the cable warning is always displayed to remind you that AC cables with a depth of up to 50 mm to avoid drilling cables. Suitable for professionals and DIY enthusiasts. 4. Large LCD display + sound warning: the metal detector has a large LCD display along with the large acoustic warning to detect the exact position of the objects. When the material has been found, the LCD display shows the direction and intensity of the beep and tells you whether they are closer to the target. The quick detection saves the user a lot of time. 5. Automatic calibration and special design: before use, you can simply press the scan button on the side of the tracking device to calibrate. Thanks to the design with soft handles, you can keep this detector comfortable. Description: This 4-in-1 stud finder is used to detect wood, gypsum board, the center position of the wooden stem in the wall of the material, the metal position and the live wire, and it has an AC warning function. Specifications: Working power supply: 9V Alarm modes: tweet Measuring range: 19-51mm Detection metal size: 60mm Size: 172*76*37mm Scope of application: gypsum board, partition wall Package Included: 1 pc * Wall Scanner(battery not included)