[Accurate and Sensitive] The stud finder is equipped with a highly sensitive intelligent microsensor chip that accurately and quickly detects the edges and centers of metal, studs, joists, pipes, and AC wires behind walls, floors, and ceilings. Whether you're decorating, hanging pictures, or doing DIY, it can precisely locate the exact location of fixtures and accessories with up to 1/16 inch (1.6 mm) accuracy and 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 1/2 inch (13 cm), 1 inch (25 mm), and 1.5 inches (38 mm), metal scanning mode 2.36 inches (60 mm), and AC scanning mode 2 inches (51 mm). [LCD Display & Audio Alarm] The tool's LCD display and audio alarm provide clear and audible signals to indicate the direction and intensity of the target. The LCD display has a bright backlight function for clear visibility even in dark environments, indicating detection mode, center pointing, low battery indicator, and more. The beep alarm alerts you when you're closer to the edge or center of the target. [Automatic Calibration & Wire Warning Indicators] Proper calibration before every use provides maximum reliability and accuracy, reducing errors in the application. The weld line warning test operates at depths of up to 2 inches (51 mm) in both stud scan and metal scan modes, alerting you of AC power lines and eliminating safety hazards during construction. [User-Friendly Design] The tool's ergonomic anti- grip and top-grade plastic frame provide comfort and 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 and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.