[Accurate Sensitive] The stud finder is equipped with a highly sensitive intelligent microsens chip that accurately quickly detects the edges centers of metal, studs, joists, pipes, AC wires behind walls, flos, ceilings. Whether you're decating, hanging pictures, doing DIY, it can precisely locate the exact location of various fixtures accessies with up to 1 or 16 inch (1.6 mm) accuracy responds in less than 1 second. [5 in 1 Multifunctional Detection] This wall scanner features 5 scanning modes to suit different wall material thicknesses: stud scanning mode 1 or 2 inch (13 cm), 1 inch (25 mm), 1.5 inches (38 mm), metal scanning mode 2.36 inches (60 mm), AC scanning mode 2 inches (51 mm). [LCD Display and Audio Alarm] The tool's LCD display audio alarm provide clear audible signals to indicate the direction intensity of the target. The LCD display has a bright backlight function f clear visibility even in dark environments, indicating detection mode, center pointing, low battery indicat, me. The beep alarm alerts you when you're closer to the edge center of the target. [Automatic Calibration and Wire Warning Indicats] Proper calibration befe every use provides maximum reliability accuracy, reducing errs in the application. The weld line warning test operates at depths of up to 2 inches (51 mm) in both stud scan metal scan modes, alerting you of AC power lines eliminating safety hazards during construction. [User-Friendly Design] The tool's ergonomic anti- grip top-grade plastic frame provide comft convenience while scanning. Note: Battery type: 1 x 9v dry battery (delivered without battery) Material: ABS colour: yellow Package Contents: 1 x wall stud finder 1 x English manual Only the above package content, other products are not included. Note: Light reflection different displays may cause the col of the item in the picture a little different from the real thing. The measurement allowed err is 1-3cm.