The 4-in-1 stud finder is used to detect the center position of the wooden stem, the metal position and the live wire in the wall of wood, gypsum board and other materials, and has a AC warning function. Features: LED LCD green backlight screen shows the direction of the target, clear at a glance. Uses advanced sensor for quickly and accurately locating the stud, wood, metal and AC wire. 4 Scan Modes: Stud Scan (19mm/ 0.75in), Deep Stud Scan (38mm/ 1.5in), Metal Scan (60mm/ 2.36in), AC Scan (51mm/ 2in). Easy to use with LED display and AC warning function, practical tool for accurately drilling in home decoration. Applicable to metal pipes, AC wires, wooden beams and rebars. Fits for professional, homeowner or DIY enthusiast. Specifications: Type & Color: Press Button, Silver & Black/ Push Button, Silver & Black/ Push Button, Red & Black (Optional) Material: ABS + PC Display: LED Green Backlight Power Supply: 6F22 9V Battery (Not Included) Item Size: 172 * 76 * 37mm / 6.77 * 2.99 * 1.46in (Press Button); 180 * 80 * 35mm / 7.09 * 3.15 * 1.38in (Push Button) Item Weight: 160g / 5.64oz Package Size: 19 * 8.3 * 5cm / 7.48 * 3.27 * 1.97in Package Weight: 200g / 7.05oz Package List: 1 * Portable Wall Detector 1 * User Manual