FOLAI Elcetric Stud Multi Wall Scanning Device Wood Center Finder with LCD Display for Metal, H16, 3 Pack-Kitchen Shears Stud Finder detects stud up to 1.25 inches (38mm), metal up to 3 inches (76mm), presence of live wire up to 3 inches (76mm). Only three buttons, first press ON/OFF power button, then select the Mode Switch Button(Three Detecting Modes), after that just press the Scan button(at the left side of the device) and scan horizontally across the object surface. With an audible beep to remind you of the stud's location and position to find the stud center quickly. Handheld and anti-slip body for comfortable and firm grip, convenient to use. LCD with Backlight Display: Large LCD digital display with illuminated graphical and sound signal indication, also with battery level indication.