1. Product information: It uses advanced sensor technology to accurately and quickly locate metal pipes, fire pipelines, joists, wooden frames, steel bars, and support beams hidden behind walls, floors, and ceilings. It has five different scanning modes. 2. The spiral mode can detect wooden joists up to 38 millimeters (1.5 inches) deep in drywall. The metal mode can detect pipes up to 7.62 centimeters (3 inches) deep. The depth mode can detect wood and metal parts up to 60 millimeters (2.4 inches) deep. The 85 - 240 VAC mode can be used to detect live and energized wires up to 51 millimeters (2 inches) long. 3. For ease of use, please hold down the scan button for 1 - 2 seconds before testing. Automatic calibration provides users with maximum reliability and accuracy. This wall detector is ergonomically designed and can be installed at any angle. 4. The LCD screen displays the required stud fasteners and the exact stud position. When a fastener is found, an audible signal will be shown on the LCD screen to let you know if you are approaching the target. Quick detection saves users time and effort and makes the task easier. 5. Since the stud detector looks for density changes behind the drywall rather than specific materials, in stud scanning and depth scanning modes, the detector responds to metal studs in the same way as it does to wooden studs. Use the metal scanning mode to determine whether the previous stud scan reading was for a wooden stud, a metal stud, or a pipe. 6. The multi - functional wall scanner detector has a graphic LCD screen that displays many indicators during the detection process, such as signal strength in the detection mode, automatic calibration, battery indication, and maximum reading accuracy. When the battery is low, a low - battery indicator icon will be displayed to remind you to replace it with a fully charged battery in time.