【Safety always comes first】 VIVREAL devotes to developing a reliable stud finder and helping you to detect the hazard. No more worries about the annoying things during decoration with the help of this stud finder. QUICKLY LOCATE the edges and center of the objects, saving users time and effort, making the task completion EASIER. This Wood Detector can detect the Live AC Wire in all modes.Our advanced technology with beep signal alert enables accuracy detection to protect you from danger..【Four Scanning Modes】The stud finder provides four scanning modes in total for detection. Depending on the tasks you have, you can switch to the desired mode. The STUD SCAN is used for finding and locating the center and edges of wood or metal studs up to 3/4 in (19mm) deep; DEEP MODE for scanning walls for 1.5 in (38mm) deep; METAL SCAN for locating and detecting metal up to 2.25 in (60mm) deep; and AC SCAN for locating live AC wires up to 2 in (51mm) deep..【Graphical LCD Display】The Sensor Wall Scanner Beam Finder has a graphical LCD, which indicates many cues in detection, such as detection mode, signal strength, automatic calibration, battery indication with maximum readability. And the Low Battery Indicator icon displays when the battery level is getting low, reminding you to replace a brand new 9-volt battery in time. * For transportation safety reasons, the stud finder does not contain the battery..【Sound Warning】The multi-function stud finder offers the beep signal alert. When you have detected an object with the wall scanner, it will beep continually. The big sound warning together with the LCD screen helps detect the accurate location of the objects. Then a peck shape will display on the graphical screen. You can use the pencil to point the location of the object. The audible and visible cues reliably keep users informed when any object, such as metal, studs, AC live wiring gets found..【Automatic Calibration】The Stud Finder Wall Scanner would automatically calibrate itself when it is turned on. Please kindly noted that the calibration needs to be done by holding the stud finder on the wall where there are no wood studs, AC wires or metal. The automatic calibration is accurate and precise, providing users with maximum reliability, greatly reducing errors and makes sure that most objects behind the wall can be detected.